Malicious PDF — malware analysis report

Static analysis result for SHA-256 88fc1772e77be602…

MALICIOUS

PDF

74.2 KB Created: 2021-05-28 05:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f72534b45d25a8b5b3749f4b9d31cb21 SHA-1: df2cae7aa5a1d83c0c1b6ff58e3419437f8bedf1 SHA-256: 88fc1772e77be6024c0fb89b0c301471ae668694b60b6c2412c8008f94dca6a6
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The embedded URL and the document body text indicate an attempt to trick users into visiting these sites by posing as a search result. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing 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://nipisod.ru/strik?utm_term=what+is+difference+between+variable+cost+and+fixed+cost PDF link annotation
    • https://sufunisukexe.weebly.com/uploads/1/3/1/3/131381546/mumini-nosuzanoxajanin.pdfIn PDF document text
    • https://popofexepazor.weebly.com/uploads/1/3/2/6/132680818/1914418.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368770/normal_5fc7296b1a737.pdfIn PDF document text
    • https://bitugibetofovo.weebly.com/uploads/1/3/0/9/130969362/girukonogu-raxuwuliboxo-dunuzosefunofif-nenin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484815/normal_5fc5edc0e645d.pdfIn PDF document text
    • https://dagepafu.weebly.com/uploads/1/3/2/7/132740813/nuwotokuve_pamepi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_60683030d57db.pdfIn PDF document text
    • https://biwalude.weebly.com/uploads/1/3/4/6/134613088/9683011.pdfIn PDF document text
    • https://modagifamu.weebly.com/uploads/1/3/5/3/135341464/danofamiton_duzonekol.pdfIn PDF document text
    • https://lupadezojoxus.weebly.com/uploads/1/3/4/3/134318565/3778920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372983/normal_60323b3017e11.pdfIn PDF document text
    • https://kodopagedo.weebly.com/uploads/1/3/4/3/134350575/6ff64ad731.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497685/normal_60610cbc582fd.pdfIn PDF document text
    • https://wamibujobaju.weebly.com/uploads/1/3/4/7/134716207/bisude.pdfIn PDF document text
    • https://binamakizixevuj.weebly.com/uploads/1/3/2/8/132814618/fejeke_xojinasibawaj_mokepomisasi_fupegujiv.pdfIn PDF document text
    • https://botekajerojaj.weebly.com/uploads/1/3/4/7/134749353/fepifirowad.pdfIn PDF document text
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/sapotik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/769ab7b4-a917-46e0-bc24-1f01eda7dfc4/cuanto_equivale_dos_kilos_en_libras.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc776369-7020-4788-b8c7-1d36232c23b1/70707064838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dab062d1-683d-4a2e-a855-421fc6466739/69394896904.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_off0000e3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D7 5484 bytes
SHA-256: 6ece585e74af585a35e2838183661e319ec2c4b309be658981dd98356135f462
font_01_sfnt_off0000f696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 10564 bytes
SHA-256: cf4ba6c6488abddb7c4b422dec0b77402380c48b004badc001268ac3808021ca