Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb9c1196fa19262…

MALICIOUS

PDF

73.5 KB Created: 2021-06-06 03:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10751d9a0bbc8328cad824ad1a8233ac SHA-1: a42bc11a4be58481f12540d53c7905fac94d81ad SHA-256: 7fb9c1196fa19262b2132122200b8dd55b36e7991c84db12809ec5251e6a6ffc
156 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 Weebly-hosted PDFs, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged this as malicious, specifically a phishing or trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kanapikimafu.weebly.com/uploads/1/3/3/9/133997195/3016a.pdf
    • https://cdn-cms.f-static.net/uploads/4417309/normal_603f8455584e2.pdf
    • https://viborune.weebly.com/uploads/1/3/4/5/134592701/kenisuli-fulubose.pdf
    • https://wipabobape.weebly.com/uploads/1/3/5/9/135985954/xexovutogine-sixefifejami-xaginivovakufir-winapuwibemo.pdf
    • https://xidujodoj.weebly.com/uploads/1/3/1/0/131071067/fekamek.pdf
    • https://cdn-cms.f-static.net/uploads/4528959/normal_60b7a37cb4c43.pdf
    • https://tokoposejod.weebly.com/uploads/1/3/1/3/131380771/duxedagozawotug.pdf
    • https://xojutezakiveze.weebly.com/uploads/1/3/5/3/135318362/8858736.pdf
    • https://lawepisofav.weebly.com/uploads/1/3/4/4/134473025/soledeziza-konemi-lanutiduvipib.pdf
    • https://xemilesexevig.weebly.com/uploads/1/3/4/2/134266110/97b1d6484aff8.pdf
    • https://jedufopev.weebly.com/uploads/1/3/4/4/134490540/f164ecb8.pdf
    • https://static.s123-cdn-static.com/uploads/4474211/normal_60011715b9146.pdf
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/latuzakabomazu.pdf
    • https://cdn-cms.f-static.net/uploads/4490256/normal_6068cf918ada4.pdf
    • https://nebofubegifeso.weebly.com/uploads/1/3/1/4/131437549/8765421.pdf
    • https://cdn-cms.f-static.net/uploads/4415769/normal_6017c4ed3f4f0.pdf
    • https://static.s123-cdn-static.com/uploads/4408704/normal_5fe210e15366a.pdf
    • https://static.s123-cdn-static.com/uploads/4455183/normal_5fdd5a1ec6ddc.pdf
    • https://jolifovinezaxa.weebly.com/uploads/1/3/7/5/137518016/2194290.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/WboozbXZlIE/wb?keyword=onkyo%20ht-r340%20remote
    • https://uploads.strikinglycdn.com/files/7c8f6984-e17f-48b2-9c12-6dea1707de50/la_biblia_hablada_salmo_30.pdf
    • https://uploads.strikinglycdn.com/files/ba3de424-e01d-4e12-ac99-a34a0e002277/99606051808.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a3.bin
43c61c8075c6fcd2d26080f3f5de213ebedb40688fb56632cb2f3944e39ba795		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A3 5124 bytes
font_01_sfnt_off0000f309.bin
59c7e3d04b34d08a1e915f9125fba12c44b91b8822a7ab67323be805bc1e5b96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 11076 bytes

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