Malicious PDF — malware analysis report

Static analysis result for SHA-256 d941bbd791adcbd0…

MALICIOUS

PDF

71.7 KB Created: 2021-02-06 14:55:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4e549fdff1354b80c8baab6219e5348a SHA-1: fec4c6622f872e99d86a8d1d70488b41cfc80764 SHA-256: d941bbd791adcbd093f82103f3c5eb9ce19e19b069e51a9bed9472efee1ab85d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file is classified as malicious, exhibiting characteristics of a link farm designed to redirect users to numerous external websites. The document's content, though heavily obfuscated, appears to be a lure related to software development plans, likely to trick users into clicking malicious links. The presence of a large number of external links on disposable hosting, combined with ML and ClamAV detections, strongly indicates a phishing or malware distribution attempt.

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://druttle.ru/aws?utm_term=iec+62304+software+development+plan+template PDF link annotation
    • https://luwanolukurodo.weebly.com/uploads/1/3/5/3/135397368/1139395.pdfIn PDF document text
    • https://nuwofukejixi.weebly.com/uploads/1/3/1/4/131437867/gizisafujoni.pdfIn PDF document text
    • https://japiravonasuv.weebly.com/uploads/1/3/4/6/134644749/3a9e48.pdfIn PDF document text
    • https://wajizewikibi.weebly.com/uploads/1/3/5/3/135326478/4745580.pdfIn PDF document text
    • https://betufevu.weebly.com/uploads/1/3/4/0/134098732/vixagonogofamezapuw.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/bizozep.pdfIn PDF document text
    • https://gupijevud.weebly.com/uploads/1/3/1/4/131407369/motidapufo-liwug-sofane-panodewoxejum.pdfIn PDF document text
    • https://padobijitoxu.weebly.com/uploads/1/3/1/0/131070591/bawom_gewumiso_fedesu.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/wegitejenezeru.pdfIn PDF document text
    • https://piwupibuzidiki.weebly.com/uploads/1/3/0/7/130739867/nevutadej.pdfIn PDF document text
    • https://tepidupelagoxu.weebly.com/uploads/1/3/4/4/134472529/xometogure-kasusenomoti-lebufijuwo-guwuxijobexepol.pdfIn PDF document text
    • http://bopepon.22web.org/annexure_sheet_federal_circuit_court.pdfIn PDF document text
    • https://sozuxope.weebly.com/uploads/1/3/4/8/134873608/wepifubi-zukomotojipubew-duduke-wupodire.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://saxogif.epizy.com/formalism_theory_in_english_literature.pdfIn PDF document text
    • http://xuwugufufokiti.epizy.com/fofegubifuzaj.pdfIn PDF document text
    • http://zowomazo.epizy.com/92968379442.pdfIn PDF document text
    • http://lilufunom.epizy.com/bovogodozut.pdfIn PDF document text
    • http://tivanebizogosa.rf.gd/sarulafuji.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BA 6072 bytes
SHA-256: 1cff86c6711bc11d27300a79c2a9f787a37aa08e50476c4b2c4a6ea131c76fdb
font_01_sfnt_off0000ec70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC70 10816 bytes
SHA-256: fdce2b5c231d21eca1d66c686ada8a00d48b4896692cbcc5f431190d25f9ec33

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