Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b44049939f6e411…

MALICIOUS

PDF

80.4 KB Created: 2021-03-30 02:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0ca27a4cca815b12f51ad54144eea598 SHA-1: ee1990bac34820213a096ed0a83614fd9f69f3f0 SHA-256: 1b44049939f6e411df65798ba85f428013a33b2193d219c6618c9b963fe9ed58
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=star+trek+ringtones PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382960/normal_5fe320410e570.pdfIn PDF document text
    • https://lotinusola.weebly.com/uploads/1/3/4/3/134321880/kinix-rosuwu-mubudimajodevut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417423/normal_5fe0a7942a46e.pdfIn PDF document text
    • https://nubapatis.weebly.com/uploads/1/3/4/0/134095887/sufiwelobub-pubivemidapi.pdfIn PDF document text
    • http://wudaxozibutix.sportsontheweb.net/konica_minolta_c220_service_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391326/normal_5ffffd3851452.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://japinoxizidunub.myartsonline.com/petroleum_production_systems.pdfIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_6aa65d21ebd74a1db2b4b1e9a4e3b488.pdf?index=trueIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_6ffe4a6914b44735b7e220067b138054.pdf?index=trueIn PDF document text
    • http://lurarapekakaka.atwebpages.com/actinobacillus_actinomycetemcomitans.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_f75d651b380d438a8f843d29cd1851a1.pdf?index=trueIn PDF document text
    • https://d6504552-49b0-4b7d-b1ff-94f9e1082b83.filesusr.com/ugd/1f0558_98a883f824c343fcb5f00218dfdb2408.pdf?index=trueIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_9aaafb8f590f4cab934375fde7191c92.pdf?index=trueIn PDF document text
    • http://tosipasakuvil.myartsonline.com/enlace_fosfodiester.pdfIn PDF document text
    • http://jisijuvod.myartsonline.com/solar_energy_questions_to_ask.pdfIn PDF document text
    • https://e4c06157-4c4c-4c30-848d-1ce07482e123.filesusr.com/ugd/99e070_87b50b352789444095c16a88f8433632.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_off0000fd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD45 4988 bytes
SHA-256: 2569bc78597b4cff717d905db8b6679eefc644bd6b3327746b7f9ea7b507ddb6
font_01_sfnt_off00010e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4D 11520 bytes
SHA-256: 6e4ab2583d803dc1099e30081e03f7d9831813ce994183bb501b7f7c07720690

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