Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c1e1abcf2f0b44…

MALICIOUS

PDF

76.6 KB Created: 2020-12-31 09:42:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b0714cf009ca084136f801ebffb2bea0 SHA-1: 69ee7acbab88320da7c3f948edcfa36ea3973584 SHA-256: d0c1e1abcf2f0b441ee3a04598dd19f3f98d63c82d27cf33ca57b8e85272c0a2
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDFs, which is indicative of a link farm designed to distribute malicious content or traffic. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=doctrina+de+salvacion+tomo+3 In PDF document text
    • https://neburaguvud.weebly.com/uploads/1/3/4/4/134477844/nurimumojomenosilud.pdfIn PDF document text
    • https://sezemizom.weebly.com/uploads/1/3/4/6/134622585/zemowoziluzojugikig.pdfIn PDF document text
    • https://xasedomag.weebly.com/uploads/1/3/1/0/131071243/putulojuwu.pdfIn PDF document text
    • https://darugagoremu.weebly.com/uploads/1/3/4/5/134588092/rasoja-nogivuxanukor-xalenuk.pdfIn PDF document text
    • https://zidovularirijap.weebly.com/uploads/1/3/4/7/134718784/7201742.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
    • https://s3.amazonaws.com/fajixe/pediatric_electrocardiography.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/96191389787.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/french_imperative_form_of_prendre.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/suzuki_drz_400_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/21987712211.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/grammar_practice_test_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/13078090902.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/6618885088.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_off0000df5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 5096 bytes
SHA-256: 2b3932077ee8c1e05e9ca83653e46a8742ca22a4276600e338a4b5b63a547741
font_01_sfnt_off0000f096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF096 11668 bytes
SHA-256: 3589987df342b3c5ecb29f79110999316852b4ecb427430ca640d768681f6a6f
font_02_sfnt_off00011620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11620 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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