Malicious PDF — malware analysis report

Static analysis result for SHA-256 d401060679f867ee…

MALICIOUS

PDF

73.1 KB Created: 2021-04-03 12:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2eaafb266c600561d38c30b229444f86 SHA-1: 6082b9d3e5a8637f181b40f129181ae0d47a6727 SHA-256: d401060679f867ee7323510b1c340011cae8c2801fbd637188aa03cacf9a45da
156 Risk Score

Malware Insights

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

The sample is a PDF file that contains a large number of external links, many of which point to PDF files hosted on file-sharing services. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan payload. The embedded URLs suggest an attempt to redirect the user to malicious content, likely for credential harvesting or malware distribution.

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://ponafet.ru/strik?utm_term=here+i+am+oh+lord+send+me+lyrics
    • https://jidisoluko.weebly.com/uploads/1/3/6/0/136097174/semivagelego_zesuwalozu.pdf
    • https://fogasofimoxor.weebly.com/uploads/1/3/1/0/131071298/zarer_luzevoranaj.pdf
    • https://cdn-cms.f-static.net/uploads/4487194/normal_602f448524ccc.pdf
    • https://cdn-cms.f-static.net/uploads/4379856/normal_6062ad3825492.pdf
    • https://dopakujovifoba.weebly.com/uploads/1/3/0/7/130739833/jomas.pdf
    • https://cdn-cms.f-static.net/uploads/4385010/normal_601f01a576862.pdf
    • https://cdn.sqhk.co/mugejufunij/6xKvLgi/xanokebixulatipizuxewat.pdf
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/kojus.pdf
    • https://cdn-cms.f-static.net/uploads/4383132/normal_604d350ded09c.pdf
    • https://static.s123-cdn-static.com/uploads/4494136/normal_5fce53c21c615.pdf
    • https://cdn.sqhk.co/mowaxuso/gf62ijb/83037379928.pdf
    • https://cdn-cms.f-static.net/uploads/4458833/normal_605977d064c82.pdf
    • https://cdn.sqhk.co/jesovolavig/4Rgcuij/pagimosisepizagagutade.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/12a3c4b4-bfe0-4631-864d-ff75c8dd0dc7/11120053369.pdf
    • https://uploads.strikinglycdn.com/files/a71e400d-29d7-4914-bae6-8cdcf5399a7f/50949761751.pdf
    • https://uploads.strikinglycdn.com/files/fc16aaf7-b70f-42d9-96b8-12488b95315d/76213339641.pdf
    • https://uploads.strikinglycdn.com/files/0de8fe10-b4f6-4f10-9061-4a4925d84a6f/lasko_tower_fan_costco.pdf
    • https://uploads.strikinglycdn.com/files/2584e653-9b43-41e9-9667-c2a9358bb46d/24047082176.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_off0000de68.bin
ecc3667af3dbac13a9f5d244b98ab2856ce5adf855a8713e09b9413fc2780628		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 5240 bytes
font_01_sfnt_off0000f014.bin
5f6b3c43a1eb236750a59448197270faea06bc7f2497fb1d990fe9490c6a0b91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 11044 bytes

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