Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1a548b6bc30942…

MALICIOUS

PDF

112.8 KB Created: 2021-03-29 20:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 851f6a35263d26ec3720cff3a2cd962d SHA-1: 297515328961a8f8a695f4f59a865266090327a8 SHA-256: 0b1a548b6bc30942b26310a18c28d5438274374cded17c9da62e246058d27ffc
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to potentially malicious sites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=ameritron+al-80b+manual PDF link annotation
    • https://litizabege.weebly.com/uploads/1/3/4/7/134713043/rasezuzabif_vigoke_pemitivusel.pdfIn PDF document text
    • https://damowovevibip.weebly.com/uploads/1/3/0/9/130969764/denaw-misuribubi.pdfIn PDF document text
    • https://vigoxanumevu.weebly.com/uploads/1/3/4/4/134466257/1924912.pdfIn PDF document text
    • https://kofaxikizija.weebly.com/uploads/1/3/4/3/134336932/7049150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_603b00b1b4c46.pdfIn PDF document text
    • https://lixazasowab.weebly.com/uploads/1/3/4/5/134588429/wixovafuzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383138/normal_6058a983efd73.pdfIn PDF document text
    • https://siwufofewexiv.weebly.com/uploads/1/3/5/3/135329456/vemojaja.pdfIn PDF document text
    • https://vopobibipudo.weebly.com/uploads/1/3/4/6/134620476/derinekadem.pdfIn PDF document text
    • https://rokozozo.weebly.com/uploads/1/3/4/4/134498035/87a12c973dd873.pdfIn PDF document text
    • https://voxonased.weebly.com/uploads/1/3/1/4/131407877/867bad45f418a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_d81e0d1de7274528ae897c3cbc607936.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aea7629b-388a-48c6-924e-24c957b33105/descargar_biblia_textual_completa.pdfIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_7abd0dc243974aa2a04607a10ef677ae.pdf?index=trueIn PDF document text
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_ef97ec1cd18148d6aec197dc731669d9.pdf?index=trueIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_3526ea8b431948d8bb991c3271957a84.pdf?index=trueIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_83bb167923234c26887409231cdd1613.pdf?index=trueIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_0d86327aecb54fca8154756de236c73a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a66a43-6a69-4ae3-a47e-425dece7849f/on_the_genealogy_of_morals_nietzsche_summary.pdfIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_55da49c6a4a84bbd8febfb038bcb7317.pdf?index=trueIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_17c03e5eb1ad4abfbf8afe955ae038a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c899958a-81a3-484a-befb-44472549fd8c/chattanooga_hydrocollator_model_2402_manual.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001777c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1777C 5152 bytes
SHA-256: 1dbf36ceb6052eb4d42bd0becec5c1b109e40cdb071263f2e01d2e165301a16c
font_01_sfnt_off000188e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188E4 13052 bytes
SHA-256: b1be80131da5d8a76b4eb25aadc9d08eca3a67f85eb0b22667df31cc10d44c9f

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