Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67f7dceed77ac2b…

MALICIOUS

PDF

64.4 KB Created: 2020-11-28 22:01:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4d1c1e4bf3e6f678d2d3a952d95738f8 SHA-1: dec9d7dd2e831be8004808934a5bfb83bcf4e41a SHA-256: b67f7dceed77ac2bdf4df5324bbdfd2e2006ee08f8f17c2f89c46200dcd7de45
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafffe.ru/aws?utm_term=emulator+android+for+windows+7 PDF link annotation
    • https://dowamiwimeguv.weebly.com/uploads/1/3/0/7/130775936/gulisagelugaxox_tunowipazaxu_feruzigelosiwi.pdfIn PDF document text
    • https://vemowidododujev.weebly.com/uploads/1/3/4/3/134353566/naziteti_diduzamusipubog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450140/normal_5f9e58456149c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_5fb4a5f95b3ee.pdfIn PDF document text
    • https://pujazoja.weebly.com/uploads/1/3/4/8/134880569/3a9b62f91daa174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384155/normal_5f9534e94d839.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/tibanepoxilibud/application_x-_www-_form-_urlencoded_java_request.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/ballance_game_free_full.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/abnormal_psychology_book_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/40895843884.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_off0000c06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06D 5180 bytes
SHA-256: 3858db9420f76fee12c8b37fd9e24f112ebe83aeabcba2f499c99b786d3bd6c5
font_01_sfnt_off0000d211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD211 10268 bytes
SHA-256: 4884a9a5c92f1f33558eb23e70701a76fa33ef084ab916f5c4551c5b1b122f5b