Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c95eb1725d73b36…

MALICIOUS

PDF

71.5 KB Created: 2021-02-15 15:40:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cde76f30d4e75c709a42e4f46dc376c5 SHA-1: 36aa6e74c4a96883c523947547fb0235130ddfff SHA-256: 8c95eb1725d73b3627b823eb41b3448335d860cb5a7f9b0cf812b11ef0d2a969
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings. One prominent URL, 'https://jottigo.ru/strik?utm_term=the+little+prince+mp3+free+download', suggests a lure for free downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jottigo.ru/strik?utm_term=the+little+prince+mp3+free+download PDF link annotation
    • https://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/d7b5f8d62.pdfIn PDF document text
    • https://nezuvaju.weebly.com/uploads/1/3/0/9/130969963/tagulanitelexima.pdfIn PDF document text
    • https://romenazojojeles.weebly.com/uploads/1/3/0/7/130775884/18921d7a1f687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391331/normal_5fd2daaeb9c8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382418/normal_5fe4a4a2d1575.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408336/normal_5fce511a425c7.pdfIn PDF document text
    • https://zimolitavok.weebly.com/uploads/1/3/1/8/131856331/5606041.pdfIn PDF document text
    • https://wiwujakibites.weebly.com/uploads/1/3/0/7/130740442/saraxi-mepun.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/5edd7.pdfIn PDF document text
    • https://kipopidetudi.weebly.com/uploads/1/3/1/4/131407440/tegavunobukej_lewagatirepagob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463543/normal_601daf00902a2.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/zarelusipofox/veins_arteries_capillaries_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/medical_laboratory_technology_methods_and_interpretations.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/zigiri.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/wawaxebo.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/bogisetukekodujiba.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/bizazuf.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/rulafolesedal.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/11th_scholarship_online_form_maharashtra.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/96766766555.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/clinical_trials_glossary.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_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 5420 bytes
SHA-256: 6703d488276cbedd755e966aef0b79316f4214cce318d828761a58c71ad2ea22
font_01_sfnt_off0000ece0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 10428 bytes
SHA-256: 840c6de855cc474ad900c9d6e812924a3ff321bf0d1103f7ae6011b4d3890b39

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