Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccddf483f4699bc5…

MALICIOUS

PDF

74.8 KB Created: 2021-06-07 08:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bffc20f6157ccd06031e9432ca4d4dc4 SHA-1: afb121f88712fc39423a9a5ee8f8506e39397284 SHA-256: ccddf483f4699bc5af8a819cda653cc941397ce87d68aaab60ec86b0e271f367
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

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://nomylo.ru/pbw?utm_term=bosquejos+de+estudios+biblicos+para+jovenes PDF link annotation
    • https://nuwofukejixi.weebly.com/uploads/1/3/1/4/131437867/lalixo_ronapumusuzeku_duwaxumepoda_kelake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5fdbd10ed77ab.pdfIn PDF document text
    • https://sawifumoz.weebly.com/uploads/1/3/1/3/131380604/koxotujajuxu-zabututijo.pdfIn PDF document text
    • https://bogibopedazite.weebly.com/uploads/1/3/4/0/134018154/3167845.pdfIn PDF document text
    • https://wuwonerosetopux.weebly.com/uploads/1/3/1/6/131606808/7014131.pdfIn PDF document text
    • https://jugikezifu.weebly.com/uploads/1/3/4/6/134654678/pujine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385004/normal_5fd3b667d01ea.pdfIn PDF document text
    • https://gaxasonazeg.weebly.com/uploads/1/3/4/3/134375181/gakil.pdfIn PDF document text
    • https://kawepuwaseleza.weebly.com/uploads/1/3/4/8/134849925/e79bced2fa2f5f.pdfIn PDF document text
    • https://dukowitemodilel.weebly.com/uploads/1/3/5/3/135316140/vojisifesaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475588/normal_600c60180ee32.pdfIn PDF document text
    • https://womonejod.weebly.com/uploads/1/3/2/6/132681039/gigen.pdfIn PDF document text
    • https://worozimovazez.weebly.com/uploads/1/3/1/4/131406108/3f6c3fb421db70.pdfIn PDF document text
    • https://kekipefawaro.weebly.com/uploads/1/3/4/5/134588225/waxuj-xalapetajuval-dapovodava-mavimuwigefes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470692/normal_5ff078b394323.pdfIn PDF document text
    • https://vozutububedem.weebly.com/uploads/1/3/4/3/134372478/f4f812.pdfIn PDF document text
    • https://gituruledutaza.weebly.com/uploads/1/3/4/4/134401886/gofowin_vijugojo_xevujujeson.pdfIn PDF document text
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/252576.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/8cefb1c8-d06d-4e35-94a4-a0333e29e4b0/annabel_lee_poem_shmoop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07884731-8fd7-4d5e-ae19-45a46e16a198/o_caminho_infinito_joel_s_goldsmith.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aa9ed5d-a60c-4701-b829-c688fe133b72/jemaruv.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_off0000e1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 5516 bytes
SHA-256: 85e52f29abef3f8ad05bdea4c29c6f260defa4dd533bf19045afe10fc04aad27
font_01_sfnt_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 12024 bytes
SHA-256: f6a2ec55378ab792acdde99a1c66cb764a40b02698ae99677ad4d42cf1f74791