Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0ac77cfb4f118c…

MALICIOUS

PDF

82.9 KB Created: 2021-01-03 22:54:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b6867ddb8e7ccec2f1d715056f3c2e03 SHA-1: 76294a2d680eea5ffe865eeadb93215d8227d5cb SHA-256: 8f0ac77cfb4f118ce2f55737e1e927d5d4dd5cd5f3c2f08c3c00c6e9e243cb60
214 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains a significant number of embedded URLs, many of which point to potentially malicious redirectors or link farms. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a tactic to manipulate search engine results or distribute malicious content. The presence of a link to 'traffking.ru' further supports a malicious intent.

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://traffking.ru/123?utm_term=hypertrophy+specific+training+app In PDF document text
    • https://korenumotijele.weebly.com/uploads/1/3/4/6/134687452/e029a52.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/gihbghQ/morif.pdfIn PDF document text
    • https://cdn.sqhk.co/nezafomura/jgjiVid/commuter_bike_shoes_waterproof.pdfIn PDF document text
    • https://cdn.sqhk.co/moranunemuk/ehfiaZB/51942161228.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/nidukime_xatamiribon_zabaxuna_lekadafososejed.pdfIn PDF document text
    • https://cdn.sqhk.co/molofagaji/aqkwQjh/total_war_warhammer_2_steps_of_isha.pdfIn PDF document text
    • https://betetaguzom.weebly.com/uploads/1/3/2/3/132303315/nutonos-gevalodol-domoxaxunevuzet-xatoke.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/ejcujgr/obstacles_synonyms_in_spanish_for_wonderful.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lerezazo/lost_temple_of_zios_journey_book_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ac4db84-d25a-4a5d-a509-58595851b2f6/birth_of_political_parties.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/romeo_and_juliet_act_2_answers_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ff75fc4-9c18-46b7-9112-cd19cdcbfa2a/tractor_farming_simulator_usa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d27a631b-3be8-41b2-b4b0-d6eb2ee53946/23069187245.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/fewuwevigolusaganu.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/lined_seahorse_ssp.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_off00010789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10789 5308 bytes
SHA-256: b9d4efb3bbfe70d7f89e702d16acce266a35fe5cc55077eb9f9d151d6685c46e
font_01_sfnt_off000119a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A2 10868 bytes
SHA-256: 2a439ffb1abf73975b7dfb792f9c1e9eb765e3ade05b1192f11bb90ac961e6ad

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