Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa086d859b997e3…

MALICIOUS

PDF

82.0 KB Created: 2021-05-30 09:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9e8d78bf8b56930eb2a14c8daa10a0fb SHA-1: 0b9c600bf766dc651521d48c5398e87a5353e13b SHA-256: dfa086d859b997e3c29e3f412bf79b6ef8be2f4753db017a6109de83321d8b9c
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 pointing to disposable hosting, indicating a link farm designed to drive traffic or distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/123?utm_term=engagement+ring+guide+for+dummies PDF link annotation
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/69240cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463266/normal_600f10789ac45.pdfIn PDF document text
    • https://lalurarejodu.weebly.com/uploads/1/3/5/2/135297054/punetorexojodop-kupunowunel-tekejudad-zorajejamav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486982/normal_5fd15a6c189b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458618/normal_5fe9c4d758586.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402721/normal_60064b037772e.pdfIn PDF document text
    • https://tuzibexidove.weebly.com/uploads/1/3/4/8/134852131/divovedif.pdfIn PDF document text
    • https://kitopelok.weebly.com/uploads/1/3/4/3/134355781/povufatoxokuworivan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489834/normal_5fe5739e3842f.pdfIn PDF document text
    • https://jezelide.weebly.com/uploads/1/3/0/8/130874318/kosavogoxugafig.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4374953/normal_60b19c17eada5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476434/normal_5ff4b97d61f6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496826/normal_6064f09559356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419642/normal_6067960730a5a.pdfIn PDF document text
    • https://fofebaxokawapo.weebly.com/uploads/1/3/7/4/137499404/95065.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528876/normal_5fc6cc043626c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393353/normal_5fe3b45100634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405641/normal_602872250b23d.pdfIn PDF document text
    • https://mizevazorabij.weebly.com/uploads/1/3/5/3/135347525/fufofixegenod-larogapifu-xisesabozep-naduw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370074/normal_6027399b7fbf4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365652/normal_5fe02569bedd3.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/naleniw.pdfIn PDF document text
    • https://loxufoxoxow.weebly.com/uploads/1/3/5/9/135982175/3e9a699f652d.pdfIn PDF document text
    • https://pezobarifad.weebly.com/uploads/1/3/5/3/135394950/xatofa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000101f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F8 5152 bytes
SHA-256: c529edde05e5e9358dfe404c77defcf3ad8dd7e6837e4b8cc1dd98ca3e948fe9
font_01_sfnt_off0001136f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136F 11520 bytes
SHA-256: e21e9756a0569948368713d60dbee786b3aa4039183dc7ac473573b0c4dd287e