Malicious PDF — malware analysis report

Static analysis result for SHA-256 74fb673b42752e2f…

MALICIOUS

PDF

104.5 KB Created: 2021-06-06 10:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 19ffdee5e0d1c244489ecc617bcceccc SHA-1: 2373b5d52b858c2b1cb62fde993b32f452ce7ed5 SHA-256: 74fb673b42752e2f4473565f79172ad4fb53c3c8e59f655007b85ced7115189a
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 SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

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://pixomot.ru/pbw?utm_term=realidades+2+capitulo+7a-7+answers PDF link annotation
    • https://nitowapesapu.weebly.com/uploads/1/3/4/4/134442046/45d5f69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409244/normal_5fe6ccfbcd129.pdfIn PDF document text
    • https://lujomawaki.weebly.com/uploads/1/3/4/5/134577487/pezafon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464702/normal_606d31a96c5f1.pdfIn PDF document text
    • https://naroxelilokatud.weebly.com/uploads/1/3/1/3/131384214/zimego_sexekom.pdfIn PDF document text
    • https://nudidilekeluxi.weebly.com/uploads/1/3/4/3/134384451/nekawofuje_bunawedo_xevogawabo.pdfIn PDF document text
    • https://sewogasi.weebly.com/uploads/1/3/1/1/131163712/sulesanexotirimiwul.pdfIn PDF document text
    • https://xijadusulotogu.weebly.com/uploads/1/3/6/0/136089771/sunegilox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414501/normal_5fec91ca0f6c7.pdfIn PDF document text
    • https://rixapozati.weebly.com/uploads/1/3/4/4/134456921/lagagekedevub_musaxatad.pdfIn PDF document text
    • https://wawukonuxoni.weebly.com/uploads/1/3/4/0/134095992/ab59a23cfd541db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493550/normal_6021e8268690f.pdfIn PDF document text
    • https://puzuzabijil.weebly.com/uploads/1/3/2/8/132814257/tijebufesokofesozek.pdfIn PDF document text
    • https://wiselorasen.weebly.com/uploads/1/3/0/7/130739143/tedev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xadobodit.pbworks.com/f/passive_voice_exercises_with_answers_multiple_choice.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/w/file/fetch/144424761/descargar_libro_diario_contabilidad_excel.pdfIn PDF document text
    • http://povelin.pbworks.com/f/up_and_up_coldplay_lyrics_genius.pdfIn PDF document text
    • http://gegoxelaw.pbworks.com/w/file/fetch/144686556/how_to_solve_maths_equations_fast.pdfIn PDF document text
    • http://nagomax.pbworks.com/f/43084117646.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_off00015b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B17 5408 bytes
SHA-256: 1ff3188294b94ebdb0a4136c50e4246ab5fa4c534a63727bd0f55a4d17c3ba0b
font_01_sfnt_off00016db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DB3 11712 bytes
SHA-256: fd13555d82d23c29c2dca3211b33e54dbe11538480cbe4633f5c76ae05c04e71