Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c385fa626776667…

MALICIOUS

PDF

70.4 KB Created: 2021-02-24 06:52:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55a5ab26d664f22271828bf910efc8b3 SHA-1: d0b2c967d0d9d5ee566e10abb805db02648fdaa7 SHA-256: 2c385fa626776667615d9b4921c313954e4a9b79ba4bd4fe559ea3752eb7f25c
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards malicious activity, likely involving directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=eso+crafting+writ+board+locations
    • https://cdn-cms.f-static.net/uploads/4375517/normal_6025a7b6b85c2.pdf
    • https://cdn-cms.f-static.net/uploads/4450898/normal_5fd71adca13a2.pdf
    • http://sinagitozuram.22web.org/ahirani_tadka_mashup_part_4.pdf
    • https://cdn.sqhk.co/lomasamube/jhgjgne/valve_body_rebuild_cost.pdf
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/8405869.pdf
    • https://static.s123-cdn-static.com/uploads/4393486/normal_5ff40acab91c6.pdf
    • https://cdn-cms.f-static.net/uploads/4500904/normal_602ca3b8962f4.pdf
    • https://static.s123-cdn-static.com/uploads/4467975/normal_6008b59cbaad5.pdf
    • https://binelotetite.weebly.com/uploads/1/3/4/0/134016953/tizibudu.pdf
    • https://cdn.sqhk.co/nujoxodove/OifhgrW/winston_zeddemore_ghostbusters.pdf
    • https://rozenawaxu.weebly.com/uploads/1/3/4/5/134517597/8d8f9c8df7a6e6.pdf
    • https://retariluwefise.weebly.com/uploads/1/3/4/8/134858211/3925645.pdf
    • https://zojopufowe.weebly.com/uploads/1/3/4/5/134523349/7035349.pdf
    • https://xewidepomizexas.weebly.com/uploads/1/3/0/7/130775014/3319138.pdf
    • http://rifikelatukuw.iblogger.org/what_does_physical_and_mental_stamina_mean.pdf
    • https://kivalake.weebly.com/uploads/1/3/4/8/134885121/15cf871ec7e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000d6af.bin
4ecbb5c6bb37f13db51d7535bcde231de536802e9f54a8ed59ee5f6d32ea8c1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AF 5380 bytes
font_01_sfnt_off0000e91d.bin
66246b48001148e6932149e4efc5d283dc4579368ad110cbd4c4ff4376f7dacb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE91D 10428 bytes