Malicious PDF — malware analysis report

Static analysis result for SHA-256 c021b672fd0219a9…

MALICIOUS

PDF

72.1 KB Created: 2021-03-20 16:26:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07f1e3192494086e70ea59021563a02f SHA-1: 781c186cdf6696ce512ec5a32206d39c9d3eea3d SHA-256: c021b672fd0219a9fe02747ab19ca0d21b220ad8c08b4016e6acc47dccc78d90
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through the linked content. The embedded URLs and the nature of the link farm point towards a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-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://nipisod.ru/award?keyword=verbal+vs+non+verbal+communication+pdf
    • https://rigawegafo.weebly.com/uploads/1/3/4/5/134587157/vikuxezax-salaxifodelufel-zosunurob-nenirulap.pdf
    • https://cdn-cms.f-static.net/uploads/4422134/normal_601dbd5e7702f.pdf
    • https://gizazegixewaner.weebly.com/uploads/1/3/4/5/134596748/6062531.pdf
    • https://nulepapilix.weebly.com/uploads/1/3/5/9/135957677/6094182.pdf
    • http://pusewuvi.medianewsonline.com/bryant_plus_90_secondary_heat_exchanger.pdf
    • https://tatelemu.weebly.com/uploads/1/3/1/1/131164239/juxamazezusunosorulo.pdf
    • https://baputopozim.weebly.com/uploads/1/3/5/3/135336161/cb4b86249cb.pdf
    • https://cdn-cms.f-static.net/uploads/4365601/normal_604e6d3124eb1.pdf
    • https://cdn-cms.f-static.net/uploads/4382408/normal_604b8196b1a8e.pdf
    • http://xirijapip.mypressonline.com/single_column_cash_book_problems_and_solutions.pdf
    • https://rokajovata.weebly.com/uploads/1/3/4/3/134376264/xitim.pdf
    • https://sinipipa.weebly.com/uploads/1/3/0/8/130874509/1157890.pdf
    • https://sozizupisez.weebly.com/uploads/1/3/1/8/131872239/71cae559d5779.pdf
    • https://cdn-cms.f-static.net/uploads/4483604/normal_6042b611e4262.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_76beb94f14ec47498fd34809384c1cf0.pdf?index=true
    • https://0029a690-d003-4268-bdc7-e74daa5a0415.filesusr.com/ugd/a4b355_9b98d15626834c048c5fd70083f2658b.pdf?index=true
    • https://2ed9768e-82a7-41f7-bc91-4b86d8d7aa0f.filesusr.com/ugd/bdbd91_0f3c1ecf7b3a42c7aca04c63421fdea2.pdf?index=true
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_e2b6111816944e49b04a75cfbcc2b5e4.pdf?index=true
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_196d50a40fb547668a06828246b7af4b.pdf?index=true
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_633a8502d44b4fe39bef79859bf6b4da.pdf?index=true
    • 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_off0000dac9.bin
b970e9355e0a79aa1d91c6eda21911342af93f6ab25464537fa312714905252b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 5464 bytes
font_01_sfnt_off0000ed4e.bin
b9a5bc35339e53051cd45aa3427b9a1a8e5bba909c23d4d0b632e0d5b9634b6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED4E 10640 bytes

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