Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11822c319ad5fda…

MALICIOUS

PDF

66.0 KB Created: 2020-12-21 17:48:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 664ec5051665d7d50f64a75a39d94d03 SHA-1: 903ee36f558753a7e59cfb56b75f1e0edc21d047 SHA-256: b11822c319ad5fda6c1d0b39c05be3616b1655b7396fbfac436ce4d2b4dde7fd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of these URLs, 'https://traffset.ru/aws?utm_term=bibliography+apa+format+book+multiple+authors', is flagged as an external URI. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or a link farm for SEO manipulation. No scripts were extracted, but the structure suggests an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/aws?utm_term=bibliography+apa+format+book+multiple+authors
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/6a87a6a4a2594.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8e8f85d2-ea29-42aa-9b2b-67e9bf69eff8/xanupezoneliw.pdf
    • https://uploads.strikinglycdn.com/files/24188afa-0e26-4734-8ce9-5315cd3b2cfa/58351768394.pdf
    • https://uploads.strikinglycdn.com/files/4e03e8b9-7800-4f3f-937f-8b2f09247942/71297209036.pdf
    • https://static1.squarespace.com/static/5fc379dc9698b02c7f30eeb0/t/5fd109929e8e4e7d40a480a1/1607534994933/guide_succes_human_fall_flat_platinum.pdf
    • https://static1.squarespace.com/static/5fc5de1b7848ba205d3add58/t/5fcf7270cd9a2056ff77501c/1607430768995/the_phone_number_to_yellow_cab_company.pdf
    • https://s3.amazonaws.com/kosipefojaw/microsoft_word_cheat_sheet.pdf
    • https://static1.squarespace.com/static/5fc2e03b1c8c7413143ed9a1/t/5fc728e6a3696915e21f8ebf/1606887654842/41281851421.pdf
    • https://uploads.strikinglycdn.com/files/e81883af-0ace-4fd7-b59d-1d2be7f89656/download_tulisan_arab_asmaul_husna_d.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c615.bin
d576d77e2843f6f77aa8dfd53c2a2e5eb9fc9140525eb16076e274d7699d33f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC615 5672 bytes
font_01_sfnt_off0000d942.bin
05131c6c7cbac10e76767f56c70beecd80031af4955c16a53740f728fe3da719
pdf-font-stream PDF embedded font (sfnt) at offset 0xD942 9948 bytes