Malicious PDF — malware analysis report

Static analysis result for SHA-256 b042a9f3c24797cb…

MALICIOUS

PDF

69.3 KB Created: 2020-11-22 02:51:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4a7beba7baa5df398a6750bc43567f6 SHA-1: da6f2c8592d2b25302be9ae1bde7a8d1745dcb49 SHA-256: b042a9f3c24797cb39add1d14556542807b012b38098a7f20e6bf18dbf0503dd
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through a large number of seemingly legitimate, but ultimately harmful, PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=filmywap+bollywood+movies+2018++free
    • https://sizuxemonip.weebly.com/uploads/1/3/4/3/134315948/wetawi.pdf
    • https://cdn-cms.f-static.net/uploads/4425515/normal_5fa3ea83e07c3.pdf
    • https://solujokorox.weebly.com/uploads/1/3/4/1/134108712/zadujidep.pdf
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/duwoti-roxinesiwe.pdf
    • https://sebidodeg.weebly.com/uploads/1/3/4/4/134438526/fe094ff0624b6.pdf
    • https://cdn-cms.f-static.net/uploads/4368467/normal_5f9c09bbe5508.pdf
    • https://cdn-cms.f-static.net/uploads/4390383/normal_5fade5e5edb6b.pdf
    • https://cdn-cms.f-static.net/uploads/4465914/normal_5fb5e19a472d1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mesotodimus/java_read_to_xml.pdf
    • https://uploads.strikinglycdn.com/files/95e8b7b2-e79e-4f50-94de-58f5aae46c90/purpose_driven_life_free_ebook.pdf
    • https://s3.amazonaws.com/leguvefu/minecraft_twitch_mods_not_loading.pdf
    • https://s3.amazonaws.com/wewuxuviwar/alpengeist_ride_video.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_off0000cc6e.bin
32a73bca83e39d6ea07947e596a88da83b0ea5c1f375808bc8539e8218d2aa18
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6E 6056 bytes
font_01_sfnt_off0000e10e.bin
6a321d07dadbdb10380139eed9e9e7c24403a0c4da66e54bdae41d73ac0f396a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 11468 bytes