Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5bfaf668e0c7f8…

MALICIOUS

PDF

66.9 KB Created: 2020-11-18 12:57:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66a7e31468a8f079ff3b25c9f3abd92e SHA-1: 7f87b14f155ccf8f3f478ee195b066dbb67423ff SHA-256: de5bfaf668e0c7f83a7b24822854aec311c934660d6020aa5a8531ee156d34d8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. While no scripts were extracted, the embedded URLs are the primary indicators of malicious activity.

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://trafftec.ru/123?utm_term=02+mms+cost
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f8b824cdeb11.pdf
    • https://cdn-cms.f-static.net/uploads/4403141/normal_5fb2b226422b7.pdf
    • https://titobuvidotid.weebly.com/uploads/1/3/4/5/134598786/3667266.pdf
    • https://cdn-cms.f-static.net/uploads/4390051/normal_5f907402cb29a.pdf
    • https://cdn-cms.f-static.net/uploads/4371266/normal_5f936bd833270.pdf
    • https://gidepezugubuwo.weebly.com/uploads/1/3/4/7/134766768/7e2eafca.pdf
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/1cbd7990424f.pdf
    • https://cdn-cms.f-static.net/uploads/4384301/normal_5f99c29de212a.pdf
    • https://limisakaxenit.weebly.com/uploads/1/3/4/3/134371081/wizusiteb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1c55688d-561f-455d-9f97-3e54b244fdaa/uscg_towing_endorsement_requirements.pdf
    • https://uploads.strikinglycdn.com/files/bbe14585-9c00-43fd-9d43-3a44a6430485/filmywap_bollywood_movies_2016.pdf
    • https://uploads.strikinglycdn.com/files/7abb19e9-5e1d-42fd-b0ee-f59fc3ba87ab/xafefabevomowe.pdf
    • https://uploads.strikinglycdn.com/files/bda159c6-7568-43cb-8e15-194f09098e31/15556267383.pdf
    • https://uploads.strikinglycdn.com/files/626aff7a-a293-4cdd-a93f-67bbae0f75f6/twenty_one_pilots_stressed_out_parol.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_off0000caae.bin
8229e21d2672e260c45f41079a9ae131a8ae107afb69d08b5fab291104b0655e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAE 4788 bytes
font_01_sfnt_off0000daee.bin
f6164dfc98ea2a4005c1c6b18c0cd6592b7cadd4efba70230c5a26121fb59286
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEE 10788 bytes