Malicious PDF — malware analysis report

Static analysis result for SHA-256 2541b10ffb8190bc…

MALICIOUS

PDF

90.7 KB Created: 2021-03-27 19:23:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7f1210f2cc81eb9464dea867396ca3ac SHA-1: d6d907095ae9520410a2fcce85ae59b9c97884b7 SHA-256: 2541b10ffb8190bcb63d65bfd36e06d7f9614de9a0aefa81fe8a026b5235cc7a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jumiwimov.ru/award?keyword=bodegas+alianza+precios+pdf PDF link annotation
    • https://cdn.sqhk.co/wevujawej/heCvhbQ/3394270568.pdfIn PDF document text
    • https://cdn.sqhk.co/gulanuwe/VjgjjZ3/neputanoxurosobufasop.pdfIn PDF document text
    • http://nuwojukow.mygamesonline.org/canon_speedlite_430ex_ii.pdfIn PDF document text
    • https://cdn.sqhk.co/najafizox/3hbShf7/how_to_delete_my_wikipedia_account.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/mOhagjp/zivosexulaxirakijux.pdfIn PDF document text
    • https://cdn.sqhk.co/bopibege/ifhcheg/alan_walker_faded_lyrics_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dugixikisim/ejjLpF2/nasatibugututi.pdfIn PDF document text
    • http://samafutanub.mypressonline.com/scores_delivery_menu.pdfIn PDF document text
    • http://gebigulexejo.sportsontheweb.net/55424681811.pdfIn PDF document text
    • http://zonojebiridizo.mywebcommunity.org/95608719208.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pewibim/constitucion_reformada_bidart_campos.pdfIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_9cbb0e94edac464b806ba072d625a444.pdf?index=trueIn PDF document text
    • http://lawigut.rf.gd/xokok.pdfIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_86747446b3a1454585213813266b8d08.pdf?index=trueIn PDF document text
    • http://winexuxipowef.epizy.com/tinalelisafevuwerotoke.pdfIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_a88a078835d84a10a44766cb576a375a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/dexusogafotusimekade.pdfIn PDF document text
    • http://navezep.epizy.com/69899164874.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/how_to_reset_time_on_verifone_vx520.pdfIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_9cb9220832c64ec980b610e1be5811e5.pdf?index=trueIn PDF document text
    • http://jopuzasoxu.rf.gd/types_of_landforms_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/how_to_say_nasty_in_greek.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/kagovawulipema.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_329d8bb0218d4726b0030f6b2e5b39e7.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 5424 bytes
SHA-256: 919499e25dfc6787913d4ef713441b73a87de4acb86a00943157ce8159ddcaea
font_01_sfnt_off00013628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13628 11868 bytes
SHA-256: e5a9129f4a5ddcf656ee2681d99fcb3cd6d92912a708b92f4cf99d3ef4d5cb93

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