Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9aac40c5e00262…

MALICIOUS

PDF

112.1 KB Created: 2021-04-01 10:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2074a748b6d25f44bc87fe7f4e99638a SHA-1: 48fcae2fa582d76232fa5c7f269bc79103ac74b2 SHA-256: 3c9aac40c5e00262d19733b5fd5d6c571fa692419481126a0d648a465e3fa948
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious or spam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/award?keyword=l+amiti%25C3%25A9+d%25C3%25A9finition+pdf
    • https://zoditivifu.weebly.com/uploads/1/3/4/3/134316547/1451db6e80.pdf
    • http://pazadixokumox.sportsontheweb.net/58956653408.pdf
    • https://pojixaguwor.weebly.com/uploads/1/3/1/4/131453565/a073f3f4a8.pdf
    • https://cdn.sqhk.co/wadusazilox/ahiljjM/the_tiger_king_netflix.pdf
    • https://cdn.sqhk.co/zafowavo/gfljbf8/35797716895.pdf
    • http://jarevine.mywebcommunity.org/jezigezu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b592a37b-6b5f-4a5b-96f9-bc9f708ed3c3/que_es_la_planeacion_financiera_segun_autores.pdf
    • https://uploads.strikinglycdn.com/files/092af637-7d9b-48cd-be58-09e5f149d419/16778819744.pdf
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_bac4211cc33449c597a8583ab8d3c64a.pdf?index=true
    • https://s3.amazonaws.com/nopomewegobij/72079601323.pdf
    • https://uploads.strikinglycdn.com/files/e4eda66e-f665-4d77-838e-2f5b345c6472/common_nouns_worksheet_1st_grade.pdf
    • https://uploads.strikinglycdn.com/files/754330cf-e6d6-4015-9ddc-a226b4cbd16b/fusefudilisututujegu.pdf
    • https://34fef40c-4934-4c56-b24d-59915ed92566.filesusr.com/ugd/806295_23f163f8826440c4b670875cc806921a.pdf?index=true
    • https://s3.amazonaws.com/ruzumeb/98757934320.pdf
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_0462e84ec70947f09b2850bebc0198cc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/63ec5a30-78e3-4ade-bf97-7a5724d6e2f2/garp_frm_practice_exam_2016.pdf
    • https://s3.amazonaws.com/dutimajizowa/visavo.pdf
    • https://s3.amazonaws.com/kovibu/epson_workforce_600_review.pdf
    • https://79ab8074-8148-4faa-9219-f6cdfa35bc15.filesusr.com/ugd/99e004_3440f1359e574f16a8d6ed6ed75af16b.pdf?index=true
    • https://s3.amazonaws.com/lumixi/15520389326.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016aa3.bin
0eed08df349c7867233dd756d25825adef37c91beecf8da1f34c4f85950b54ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16AA3 4632 bytes
font_01_sfnt_off00017a52.bin
b8fa84ec81821fac4682e2d882a9ab603b7f7f4633acf655110ee745a524a4e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A52 13080 bytes
font_02_sfnt_off0001a2a9.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2A9 4324 bytes

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