Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a58cbe64fd63176…

MALICIOUS

PDF

67.5 KB Created: 2021-01-01 00:17:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 83dd62902b432dc6909652e13df061e4 SHA-1: 8f3d3212b73870692ec328f9a6650cd81ba528de SHA-256: 8a58cbe64fd63176503bc7afccf6624064fb8d08f0c994bd89db9bee9cff8f32
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself suggests a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafftec.ru/wb?keyword=drown%20out%20overwhelm%20crossword%20clue PDF link annotation
    • https://cdn.sqhk.co/mugapowejog/gjKgjjg/44334373465.pdfIn PDF document text
    • https://wukugisusip.weebly.com/uploads/1/3/2/6/132695501/fapaxogemob_gokesekaneziwax.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/Ryaogc7/popcaan_block_traffic_lyrics_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dabelego/hegfieA/residence_inn_long_beach_airport.pdfIn PDF document text
    • https://cdn.sqhk.co/domuduxuro/iLXgdUe/jexubikateb.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/sikuva/22820175276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65906ff7-553c-4873-8e65-48726cd53d7f/first_in_first_out_algorithm.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/pobebivamepiwusuxebijono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0000c4f-9ffb-4229-9766-1f93dde77503/takagisutowudalelubas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/000b4801-c330-4565-a54d-455565a10ad8/89402462458.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_off0000ca14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA14 5120 bytes
SHA-256: ecf35d17673326ff9c695137df245481eb7d3337b68270a1c129f84254fbd62f
font_01_sfnt_off0000db73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 11264 bytes
SHA-256: 211419a603fec9d7535d750eb2e85ec3b7cc7888ae841b676fbc8e4209f2920a