Malicious PDF — malware analysis report

Static analysis result for SHA-256 044857329f53986d…

MALICIOUS

PDF

138.0 KB Created: 2021-06-01 08:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a31b36c415cf6bf46c486766165d6454 SHA-1: 01984a4ceb114923b115bab281679ba58dae996d SHA-256: 044857329f53986dfa933b28ae4af52b0e419bb032837c9fb5670fe7a90c8b6a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to reference assembly instructions for an IKEA bed, a common lure for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9788

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://huntic.ru/pbw?utm_term=ikea+tuffing+loft+bed+assembly+instructions PDF link annotation
    • https://xagigerabep.weebly.com/uploads/1/3/1/4/131483632/82f635a.pdfIn PDF document text
    • https://fofelopuvamugav.weebly.com/uploads/1/3/4/7/134716477/5af15c87244b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386074/normal_604dce68d9557.pdfIn PDF document text
    • https://vogovolakufa.weebly.com/uploads/1/3/4/8/134874318/garurololuz_vobiwodajined_towizi_jotorabolik.pdfIn PDF document text
    • https://vewusijonaw.weebly.com/uploads/1/3/4/4/134489037/4513857.pdfIn PDF document text
    • https://tivubolo.weebly.com/uploads/1/3/1/8/131857038/b068121c.pdfIn PDF document text
    • https://jofogeva.weebly.com/uploads/1/3/4/5/134505403/lunuberetirivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460048/normal_601b39e06545d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_6031c3e584641.pdfIn PDF document text
    • https://xuwejemeluk.weebly.com/uploads/1/3/4/3/134314543/4023326.pdfIn PDF document text
    • https://bepikirutufuw.weebly.com/uploads/1/3/4/8/134866592/baroxekevad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486061/normal_5fc742ccc7788.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_606b91c860540.pdfIn PDF document text
    • https://suzefajadovu.weebly.com/uploads/1/3/4/5/134592553/poverareboguvomazon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/442f8165-261d-496a-8674-b0ea22b30400/21847376829.pdfIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144441030/is_ada_wong_a_villain.pdfIn PDF document text
    • http://zegugas.pbworks.com/f/monakelo.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144413997/can_you_cook_stuffed_chicken_breast_on_the_grill.pdfIn PDF document text
    • http://fixunomavow.pbworks.com/f/watirabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a1ea338-9cb8-4f66-8811-b7bd6552e5ca/51822350420.pdfIn PDF document text
    • http://watusuxipidu.pbworks.com/w/file/fetch/144423495/different_kind_of_depression_medicine.pdfIn PDF document text
    • http://wojipag.pbworks.com/w/file/fetch/144413409/rewadepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f744dcf5-a8aa-49d9-b66d-518bbd260c6c/how_many_pages_in_hunger_games_book_2.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/w/file/fetch/144445935/winojekulurewexe.pdfIn PDF document text
    • http://wozixokumo.pbworks.com/f/playstation_network_forgot_password_and_date_of_birth.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/bypass_frp_samsung_s6_edge_plus_android_7.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/roles_grupos_cooperativos_primaria.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001e080.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1E080 23684 bytes
SHA-256: f9283186cdf3d75f5661460fb7f087cad18b3b04fb7d218d0ca2b5ad140ab112
font_00_sfnt_off00015012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15012 25932 bytes
SHA-256: 6489f1aa67907947d82ac24f8850dd166465cd1a2b506dc6121cbc90ce45f221
font_01_sfnt_off00019ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FF0 5464 bytes
SHA-256: dcb93af371c88d556a712b5140776e2c861259aae169bd7c10ccdfe6a7f5f6dd
font_02_sfnt_off0001b270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B270 14308 bytes
SHA-256: 5bbaa3ae270de6ad7b8b43638922c26e24915b916e3c8c45e5e1a175c4ff130e
font_04_sfnt_off00020ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20ADE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3