Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9836a503381d801…

MALICIOUS

PDF

48.0 KB Created: 2021-01-16 11:22:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59fa82dd8e2f85e433a37a83dcf2dfd3 SHA-1: a2d9f77de7d8f24349e79727537035b6cd4e0033 SHA-256: e9836a503381d80100db32d9033229c15f17f8cfc52668f77c8cc0c4a6a2bdf6
212 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting a link farm used for SEO poisoning or distributing malicious content. The ML classifier and ClamAV detection further support the malicious nature of this PDF. No scripts were extracted, but the presence of malicious links is sufficient evidence of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9645

Heuristics 4

  • 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
  • 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/123?utm_term=cursive+letter+m+worksheet
    • https://cdn-cms.f-static.net/uploads/4417670/normal_5fa6e4aaa93de.pdf
    • https://cdn-cms.f-static.net/uploads/4407996/normal_5fa3cea2abdd1.pdf
    • https://cdn-cms.f-static.net/uploads/4380674/normal_5fc221cccc0af.pdf
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/toriroze.pdf
    • https://cdn-cms.f-static.net/uploads/4378846/normal_5fa49e0d6555b.pdf
    • https://static.s123-cdn-static.com/uploads/4424672/normal_5fcbd3bdd8bdb.pdf
    • https://site-1202168.mozfiles.com/files/1202168/wojciech_eichelberger_chomikuj.pdf
    • https://tijirurilulade.weebly.com/uploads/1/3/4/3/134312421/lafonexewokud_varono_tesufuwasawe.pdf
    • https://mijibetifud.weebly.com/uploads/1/3/4/6/134653630/latukika_rukoxosif_wufumozufedi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kepevipawit/how_to_teleport_to_spawn_in_minecraft.pdf
    • https://s3.amazonaws.com/tiduro/93413888573.pdf
    • https://s3.amazonaws.com/towakog/54403873201.pdf
    • https://s3.amazonaws.com/difigomisosak/dinijipuxiranujora.pdf
    • https://s3.amazonaws.com/podawakumepewez/costco_hours_eugene_covid.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3a6.bin
5bf6eb372aa0b132360abdc78ce815adb33167403a93acc4fa4a7d48a9414ddc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A6 4836 bytes

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