Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff6673af34805a0…

MALICIOUS

PDF

75.1 KB Created: 2021-06-10 08:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4a2bd8daa6ae890381480c79b24ed53e SHA-1: 6cdc7b2100dcc03b88461c1086acea051eed3565 SHA-256: 8ff6673af34805a0d08d6bb0eb03b9ee08c992a1a330e2a1f30780b6fbdf5507
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to link farms and disposable hosting, suggesting a phishing or SEO abuse campaign. The presence of external URIs and a link farm heuristic strongly supports this attack pattern.

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://inwebjor.ru/pbw?utm_term=day+and+night+worksheet+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496225/normal_6035b1c5c30ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493221/normal_5fcb45439fb80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460447/normal_5fdbc35f24b2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425910/normal_5ff90697af03c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401525/normal_600fbe7a68426.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496391/normal_5fca5ed2b6968.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_602a25b58810b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lavijusana.pbworks.com/w/file/fetch/144936687/68457418719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bafd4d7-d0f8-44cb-895e-08ebcbe2bf3f/94684548050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54f1b2e2-1123-42cb-8c99-aba8f178da7d/nebilanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1180e0d-d91e-4185-bc97-08bc63db5f21/how_to_fix_an_amana_washer.pdfIn PDF document text
    • http://wuwolufit.pbworks.com/f/tetoxolosisuvem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7fbc459-d466-4916-973c-bebfb460b87f/varopijo.pdfIn PDF document text
    • http://pilujibos.pbworks.com/w/file/fetch/144577605/35781145344.pdfIn PDF document text
    • http://sofutikajen.pbworks.com/f/ghazwa_e_khyber_in_urdu.pdfIn PDF document text
    • http://bojifimaral.pbworks.com/w/file/fetch/144656340/50267144105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b52ca1ae-2a1b-4a8c-8989-50a33d7d8db8/99748063048.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA79 5100 bytes
SHA-256: 4520473c277d74ebdcb05be9bea4465966ac41d2f6400e00963911c54c65775e
font_01_sfnt_off0000ebdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 10964 bytes
SHA-256: b20522dafbc0abb9ffc020f231a4a4a77b2f8c9e0dce64c13a1ff9114d38ae6d
font_02_sfnt_off00011131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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