Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df48901280e1a09…

MALICIOUS

PDF

78.7 KB Created: 2021-03-02 21:29:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: fd77d818944d1c4aa10bd3aa771300ce SHA-1: c5c1557cff2624e29e07968ddec8f7cff730c6d5 SHA-256: 1df48901280e1a09aeaf921ea4a46d6118b9ca152ec7180d305105852076783c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, https://seumenha.ru/wix?keyword=public+policy+memo+example, is likely part of this scheme. No scripts were extracted, but the PDF structure and link farm heuristic indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://seumenha.ru/wix?keyword=public+policy+memo+example PDF link annotation
    • https://laxopewivizi.weebly.com/uploads/1/3/5/3/135394850/jusogagodutak_fomatotuwabilav.pdfIn PDF document text
    • https://pabibajezejav.weebly.com/uploads/1/3/5/3/135323938/6009407.pdfIn PDF document text
    • https://folejate.weebly.com/uploads/1/3/4/9/134902611/65cb65c8.pdfIn PDF document text
    • https://telidububiz.weebly.com/uploads/1/3/1/4/131452987/1d9e3cc098c6.pdfIn PDF document text
    • https://nitikado.weebly.com/uploads/1/3/4/6/134660078/dfa07bea60af8ad.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/finnegans_wake_rockville.pdfIn PDF document text
    • https://nolipugi.weebly.com/uploads/1/3/4/6/134652161/ee4ce2d3f4c2b.pdfIn PDF document text
    • https://tajamexuzoxobug.weebly.com/uploads/1/3/1/4/131410736/9354b01f8a5.pdfIn PDF document text
    • https://menudobuwowewil.weebly.com/uploads/1/3/4/7/134765252/6025983.pdfIn PDF document text
    • http://fesofiwig.22web.org/suvozix.pdfIn PDF document text
    • https://vojawozusuv.weebly.com/uploads/1/3/1/1/131164351/0869d1.pdfIn PDF document text
    • http://xonitaj.mywebcommunity.org/whirlpool_gold_microwave_oven_combo_door_error.pdfIn PDF document text
    • https://rusizatigaj.weebly.com/uploads/1/3/4/0/134041601/gabunepu-satadabulagixo.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://zukusuvajijip.epizy.com/the_answer_lies_within_you_meaning.pdfIn PDF document text
    • http://kexeban.rf.gd/ahuja_amplifier_circuit_diagram.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_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 4812 bytes
SHA-256: a6c1a8f621a2251fa2e9dea47c8652a4f2aaa7a4440a0e3eb40cfa254f13309c
font_01_sfnt_off0000fc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC38 10360 bytes
SHA-256: c5ba62bd4055facc2deeae4c489bc01eba450a3789c6d6ad3afe5434ca97105d
font_02_sfnt_off00011f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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