Malicious PDF — malware analysis report

Static analysis result for SHA-256 2571ce02275050b8…

MALICIOUS

PDF

78.6 KB Created: 2021-04-24 09:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 416ef8c0a4490cfcdb7acf74a0e35941 SHA-1: d4f87fbb67efce567b301529d8721b32740146f8 SHA-256: 2571ce02275050b8de202b25a8cbe8f83291e4e8b205be3f0a8354404e61e60a
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF contains heuristics indicating it is a link farm and an advance-fee scam lure, with a high ML classifier score and ClamAV detection. The document body, though heavily obfuscated, contains text related to wire transfer routing numbers, which is likely a pretext to encourage clicking the embedded malicious URL. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • 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://seumenha.ru/strik?utm_term=what+is+my+wire+transfer+routing+number
    • https://static.s123-cdn-static.com/uploads/4419192/normal_60042056377a0.pdf
    • https://cdn-cms.f-static.net/uploads/4410448/normal_6043f0c982fa9.pdf
    • http://kawlites.online/blockchain_white_paper_satoshi74pdt.pdf
    • http://jawunefuda.mygamesonline.org/journal_ennahar_archive.pdf
    • http://gosoxegekiri.mywebcommunity.org/todd_lammle_ccna_wireless_study_guide.pdf
    • http://zaranes.getenjoyment.net/metabolism_and_catabolism.pdf
    • https://static.s123-cdn-static.com/uploads/4461211/normal_5feeee995811b.pdf
    • http://yoga-fitness.space/joxuwumegqv.pdf
    • http://samyog.ru/latapay708w.pdf
    • http://xunopapazugatar.medianewsonline.com/40942381927.pdf
    • https://cdn-cms.f-static.net/uploads/4390051/normal_5fd3b0546f501.pdf
    • http://mirumumavetifun.mypressonline.com/tecnica_de_absorcion_atomica.pdf
    • https://static.s123-cdn-static.com/uploads/4490129/normal_60071ce7f0a7b.pdf
    • http://avtoshtorki.shop/colloquium_report_for_mca240kg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pevuwarobuvowa/54568491771.pdf
    • http://tibamupebunod.atwebpages.com/wutoratoxidazevimovit.pdf
    • http://nijupilunijar.rf.gd/ninuwifutawobagivokimivi.pdf
    • http://kudawugijamino.rf.gd/630774128.pdf
    • http://liwusetokabozil.epizy.com/zigakibupegobej.pdf
    • http://nowaginog.epizy.com/53131005364.pdf
    • https://s3.amazonaws.com/ritoma/romanian_deadlift_form_cues.pdf
    • http://rowoniwetob.atwebpages.com/bojizofepexu.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_off0000f577.bin
fa77afda94683c3e4c48d96e6bed079b68fd4b04f70dc0ce3e99b07a28f5b645		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 5496 bytes
font_01_sfnt_off00010822.bin
e9b9b958691b9c42430a76963ad62a0eafbcde92eb286ddae7f3b082c18f5b95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10822 10844 bytes

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