Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36df7ffed2b4735…

MALICIOUS

PDF

84.4 KB Created: 2021-03-17 05:54:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6bea1e78ce68f9e89624d69b0c0a83d SHA-1: 78f358e34c2a31a08def4b5285119541bbef0dac SHA-256: f36df7ffed2b4735b9458ec81ddfa5d47b891f7b77fa05d0ad935e24671d4b57
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The embedded URLs and the document's structure suggest it is designed to redirect users to potentially harmful content or facilitate further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://leonvi.ru/wix?keyword=who+plays+sonya+in+burn+notice
    • https://xibuzapesajeg.weebly.com/uploads/1/3/4/2/134236274/1121403.pdf
    • https://cdn.sqhk.co/parikozug/tjcKhcQ/pocket_rocket_gun_25.pdf
    • https://cdn.sqhk.co/mizipudi/dQcghhi/93601163592.pdf
    • https://wikoxunorature.weebly.com/uploads/1/3/5/9/135968981/xadoxilujab.pdf
    • https://cdn.sqhk.co/kosadara/Nyhhwij/earn_mobile_recharge_online_free.pdf
    • https://finudumibinad.weebly.com/uploads/1/3/4/3/134344164/d620cf.pdf
    • https://cdn.sqhk.co/gonolesuzam/4aX5ZE5/9542834576.pdf
    • https://dijitisabotiji.weebly.com/uploads/1/3/5/3/135324222/xipofifewovinowo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wazorixekunafob/national_geographic_brasil.pdf
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_aa63dddf505242f4b4991384443b75ae.pdf?index=true
    • https://s3.amazonaws.com/dukexajuj/83042997049.pdf
    • https://s3.amazonaws.com/kugelilizibuwum/houghton_mifflin_harcourt_answer_key_grade_3.pdf
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_485438cde7f94eb1b1c857e6a867b3d1.pdf?index=true
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_8c25600909974c50807b7f4ef9cd5670.pdf?index=true
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_2dd86f68f0d24ac6a3082a02181c225e.pdf?index=true
    • https://s3.amazonaws.com/najipavez/japejizosapesosa.pdf
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_c5998f3b104b4eacb1af75da101e57ef.pdf?index=true
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_f434470311c14e2785939c78bc6a7f3e.pdf?index=true
    • https://s3.amazonaws.com/kikunojulejuj/10355118302.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_off00010b53.bin
64463a17c6722cc1f173394c366cf7185aafc9c07d4fc996e3d2b1a617b290b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B53 5276 bytes
font_01_sfnt_off00011d4c.bin
fa69f97de38dc93fe58489b9cd3bca08de43f98c60ae273439079ea208df216d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4C 11284 bytes

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