Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f7ae0850b0fb4b…

MALICIOUS

PDF

68.2 KB Created: 2020-11-19 09:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d8baf7a2ab467cccd73cb2fe5fddd305 SHA-1: 1748fa481285c5022961dfa627e788d66a21f2c1 SHA-256: 28f7ae0850b0fb4b16d460751ead6922bdd779cd5a73d48521ec1dedea3c1fb4
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was heavily obfuscated, preventing a more detailed analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/strik?utm_term=assetto+corsa+night+mod In PDF document text
    • https://milavigik.weebly.com/uploads/1/3/2/8/132815866/datinimizu-demateg.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/ziranara.pdfIn PDF document text
    • https://nipefewemaxu.weebly.com/uploads/1/3/4/3/134387654/a1aa53b43a3f1.pdfIn PDF document text
    • https://gukepofefefika.weebly.com/uploads/1/3/1/4/131437977/8320736.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/lanaxutodi.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/sasufufa/density_of_gasoline_lb_gal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7795234-b602-4bed-8f09-0ebdf87aeb44/stevenson_middle_school_bell_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/naramuro/guide_puppies_of_seattle.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/convert_gcm_file_to_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/zexidador.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/manual_for_craftsman_lawn_mower.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_off0000caa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA0 5312 bytes
SHA-256: 064947f6b4a6d8abe1f68c1beea0ae6a2c657c7c0ff54fbb6c14f5e7897d6595
font_01_sfnt_off0000dc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC81 11580 bytes
SHA-256: b5e94b09a71120619550b30d855cc11671a6cf39f522fa5163c788ec2ab6c540

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