Malicious PDF — malware analysis report

Static analysis result for SHA-256 721938e300460fe1…

MALICIOUS

PDF

76.3 KB Created: 2021-02-27 18:16:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d67b5c8ab88d91def3c069a1e94fef65 SHA-1: 66823c1f341dbe5ee6b4913801a231ba77474bf3 SHA-256: 721938e300460fe173d4a5e4b2a9ab1beb384b327060005ea6c190aeb70674e6
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a PDF link farm. The sample contains numerous external URLs, with one pointing to a domain that appears to be part of a link farm designed to host or link to many other PDF files. The ML classifier and ClamAV detection further support its malicious nature, indicating it's likely used for SEO spam or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9154

Heuristics 4

  • 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
  • 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://bologen.ru/award?keyword=reversed+carnot+cycle+refrigeration+system
    • https://dinuboxisoxim.weebly.com/uploads/1/3/1/8/131857966/1eab5e73b80.pdf
    • http://hayatevesigar.online/febulisejivokjrvda.pdf
    • http://litvinenko.xyz/40870990960hb4d0.pdf
    • https://static.s123-cdn-static.com/uploads/4418368/normal_5fdfa09bb8deb.pdf
    • https://zejasuvosoropaj.weebly.com/uploads/1/3/5/3/135345482/tizamutufavab.pdf
    • https://kuratiwupojaxu.weebly.com/uploads/1/3/4/0/134017491/lowofa_gofile_gadegesegaw_repezizirabu.pdf
    • https://cdn-cms.f-static.net/uploads/4481990/normal_602593f763974.pdf
    • http://instacopyrighthelpteam.com/xunizexejibozevonojeba1u2dc.pdf
    • https://monowulesamewul.weebly.com/uploads/1/3/2/6/132682048/2248780.pdf
    • https://static.s123-cdn-static.com/uploads/4447098/normal_6003b4e72ad62.pdf
    • https://cdn-cms.f-static.net/uploads/4500674/normal_5fd650f6b9fe9.pdf
    • https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/dejit.pdf
    • https://cdn-cms.f-static.net/uploads/4497078/normal_5fea00fdd6297.pdf
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/vutozugaletuwuxesik.pdf
    • http://9gusevshop.website/dia_primeiro_de_maio__feriado_de_qudck3z.pdf
    • https://cdn-cms.f-static.net/uploads/4373770/normal_5fdc5f60da5df.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed69.bin
330eecb715c3dd4e897879080d757d5a1948190f9afcec2234463e74660bb431		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 5508 bytes
font_01_sfnt_off00010027.bin
be648b8ab3dc2963f796ea0b1ebf3274858917bd653d2954bc115ec61e1c61d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 16584 bytes

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