Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a80f0c30602aa47…

MALICIOUS

PDF

65.4 KB Created: 2020-12-27 00:02:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ef9232d8c3ca2523c9cac115b98895c7 SHA-1: 0d1ff076b12343b191e437bd7fc3be2e19259b25 SHA-256: 1a80f0c30602aa4737d7ac53aee95552501ea9aaefd8a36a2674f6c0b938659a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of embedded URLs and the nature of the heuristic firings suggest the document is designed to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafffi.ru/strik?utm_term=free+computer+math+games+for+preschoolers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383915/normal_5f8ccee861dcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4526930/normal_5fb73cbd6c63e.pdfIn PDF document text
    • https://vifesomojijafi.weebly.com/uploads/1/3/4/3/134337648/9828517.pdfIn PDF document text
    • https://jovimujokuva.weebly.com/uploads/1/3/2/6/132695493/b1484b0f098aef.pdfIn PDF document text
    • https://tiwapopo.weebly.com/uploads/1/3/0/7/130739059/logapotopikubit.pdfIn PDF document text
    • https://tafevivif.weebly.com/uploads/1/3/2/6/132682704/477d1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500910/normal_5fdee6bd2da1c.pdfIn PDF document text
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/tusufulokegazi.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/da50c7e0ec8f483.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zowejunef/google_play_service_apk_aptoide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17d5d3d8-f34a-4851-a2bd-db38e2ba2782/tejom.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/3764150382.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_off0000c408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC408 5384 bytes
SHA-256: 48d6a09545865f1fc0e76edc8958014954fffcfaa63d146b8f19f09d0d0805ea
font_01_sfnt_off0000d632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD632 10120 bytes
SHA-256: af9ae9a041287f4f90e1956e0f9e56d97bd50c972e3947f41239c90f038360d0

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