Malicious PDF — malware analysis report

Static analysis result for SHA-256 305812453ead8662…

MALICIOUS

PDF

80.2 KB Created: 2020-12-29 20:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11eaeb0f78ec1401dc3a79d5f8a8c54e SHA-1: d350b4fb1888cdeeb522c841550b64963a5fec05 SHA-256: 305812453ead8662830a34cd6be0f16d41adabafb4845fb5f5a2c15682594568
156 Risk Score

Malware Insights

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

The PDF contains a URL that promises a hacked version of a mobile game, indicating a lure for phishing or malware. The PDF also contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/strik?utm_term=simcity+buildit+hacked+version+ios
    • https://cdn-cms.f-static.net/uploads/4368977/normal_5f9e2e311f219.pdf
    • https://cdn-cms.f-static.net/uploads/4380223/normal_5f8af3198ad4f.pdf
    • https://cdn-cms.f-static.net/uploads/4405652/normal_5f924fc7e92fc.pdf
    • https://static.s123-cdn-static.com/uploads/4495254/normal_5fcda5eab6088.pdf
    • https://cdn-cms.f-static.net/uploads/4403806/normal_5fa4f0d58bf44.pdf
    • https://static.s123-cdn-static.com/uploads/4469623/normal_5fc6d6ea36461.pdf
    • https://cdn-cms.f-static.net/uploads/4455914/normal_5fb26396c95c7.pdf
    • https://cdn-cms.f-static.net/uploads/4453721/normal_5fa0dd74972b7.pdf
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/fefamo.pdf
    • https://cdn-cms.f-static.net/uploads/4481157/normal_5fd70090a4a2e.pdf
    • https://mimevomakiket.weebly.com/uploads/1/3/4/6/134693464/waxani-relusegudowogib-ridomomu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6c6e85f6-6d50-4f6c-9ec1-b76eb4f087e9/83208623486.pdf
    • https://uploads.strikinglycdn.com/files/ba49a6a2-6d14-4b08-b928-df1cf3b51395/immuderm_cream_on_amazon.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_off0000fa60.bin
22a35604093cf7df6322a82dc8e0e1d60f7f2202edabd2820df055819b1c3877
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA60 5648 bytes
font_01_sfnt_off00010d6b.bin
b03b93eae344e80401642536bd2c8ed050d2486ec3ee11d0d2ecfa710212fdaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6B 11444 bytes