Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6b4c8a25d80ead…

MALICIOUS

PDF

75.3 KB Created: 2021-06-10 08:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35ee30d06db911f6e5b2bebb98376c59 SHA-1: e1dc2ddb7a08877ab783a32f65fd63285f49b1b4 SHA-256: ab6b4c8a25d80ead95918d0f77b11b37f7d8394cb4d8b73ed0caa83ffc9e38a2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam and phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a mass of external links, with one pointing to a Weebly hosted PDF. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://medvor.ru/pbw?utm_term=football+team+logo+template
    • https://bivedaniliged.weebly.com/uploads/1/3/4/7/134732971/414c6e4aae2d173.pdf
    • https://xomugewobi.weebly.com/uploads/1/3/0/8/130814749/9b27a16883.pdf
    • https://static.s123-cdn-static.com/uploads/4447641/normal_5ff3001c79cf5.pdf
    • https://cdn-cms.f-static.net/uploads/4377931/normal_6038b3bf46855.pdf
    • https://mazanotofubemiz.weebly.com/uploads/1/3/2/6/132681192/zafovojilo.pdf
    • https://static.s123-cdn-static.com/uploads/4451766/normal_5fceba1abd9b0.pdf
    • https://cdn-cms.f-static.net/uploads/4461229/normal_60158fc3858c0.pdf
    • https://cdn-cms.f-static.net/uploads/4366374/normal_605d82e84f009.pdf
    • https://cdn-cms.f-static.net/uploads/4459624/normal_60263a0c3b906.pdf
    • https://cdn-cms.f-static.net/uploads/4384299/normal_60bfdbaccc6cb.pdf
    • https://static.s123-cdn-static.com/uploads/4411919/normal_5fdd7bb02a45d.pdf
    • https://static.s123-cdn-static-d.com/uploads/4452834/normal_60affea258282.pdf
    • https://static.s123-cdn-static.com/uploads/4485004/normal_5febb4b01a06b.pdf
    • https://static.s123-cdn-static.com/uploads/4470409/normal_5fdfac61a8c17.pdf
    • https://jipubegu.weebly.com/uploads/1/3/1/0/131070098/vikowuzinilebi-mosita-mufanametavev.pdf
    • https://cdn-cms.f-static.net/uploads/4501231/normal_600d33932386b.pdf
    • https://static.s123-cdn-static.com/uploads/4375698/normal_5fc666c22b06c.pdf
    • https://static.s123-cdn-static.com/uploads/4417221/normal_5ff5511bdf3bc.pdf
    • https://static.s123-cdn-static.com/uploads/4446492/normal_5fdf070460dfc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/85169dd4-6eb7-4f43-83c1-0f849e318024/ejercicios_de_caligrafia_para_segundo_grado_de_primaria.pdf
    • https://uploads.strikinglycdn.com/files/5ab84d99-b722-4958-b89f-228b8e4c4603/zisuwasegidinipurebubula.pdf
    • https://uploads.strikinglycdn.com/files/a4285e19-e7e4-4484-b6a2-488e65cfb1a4/jogixedijudajirudim.pdf
    • https://uploads.strikinglycdn.com/files/2cdc8550-1655-4922-b5e1-09c2cf257a79/50040072610.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_off0000ea8b.bin
3cfd6e6aeb9a2f90a54e3488c5dca43781cb9e04e912a0c112f84cb7107d7589
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 4960 bytes
font_01_sfnt_off0000fb60.bin
6d6c7b639fd1bd7b7f94d875fa4da8ca8d6e749129ab94e65b0a5f00802f9f6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 10652 bytes