Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a9862985798972…

MALICIOUS

PDF

77.3 KB Created: 2020-11-27 06:15:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9e3262e018b10d8dac0aab42cb3f308f SHA-1: db1ef3c771e2ac461c45811e747a091f08a0fe98 SHA-256: 39a986298579897211e2cf870a631bf310233c6db5bd6f43b8f78ce287eae839
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of multiple external links suggests a redirection-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffmen.ru/strik?utm_term=hydrophobic+vs+hydrophilic In PDF document text
    • https://xurafexejigaf.weebly.com/uploads/1/3/4/5/134588012/81bf5e3a455d.pdfIn PDF document text
    • https://tojemiwavujiguv.weebly.com/uploads/1/3/4/4/134468879/defukutolemurafepap.pdfIn PDF document text
    • https://motazejiwe.weebly.com/uploads/1/3/4/2/134266269/zoduxunikugoz-gudejilara-rewaz-tugupedora.pdfIn PDF document text
    • https://dudepemak.weebly.com/uploads/1/3/4/7/134702006/15cc874bbb4c72.pdfIn PDF document text
    • https://mivetemadika.weebly.com/uploads/1/3/4/4/134471856/gazaxuj_wurisidesegalat_valaxefajuleza_bawukel.pdfIn PDF document text
    • https://xezorilim.weebly.com/uploads/1/3/4/5/134588859/ac6b3d6a1.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/bovenotojitowe/bomejomujoxoz.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/persuasive_writing_book.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/69367538584.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/vugabuzit.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/60307777294.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/josuxuke.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/36077413425.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000dab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB5 6492 bytes
SHA-256: b9c1bd2281f23f09d905494077011cda678d8ff8a20e62f41a46584ce81a564d
font_01_sfnt_off0000eaea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEA 5216 bytes
SHA-256: b2dbae7a17f3853c0a7c9059f711937d6a74dd688f564d68fede24801068c99b
font_02_sfnt_off0000fca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA7 12900 bytes
SHA-256: a01194a27ca2e74b1a013aa6bb5bf0b88bfdb6f6e50e5eb78492f9f6944c50fc

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