Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5f61105604b495…

MALICIOUS

PDF

78.5 KB Created: 2021-04-02 13:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d1154d29c6edcaad2fdb965ecb9ee981 SHA-1: c282d9aed85bab2cc3821bb94efad105d91c2a44 SHA-256: 9c5f61105604b495ff2b9f4c39d913d31b9c59efab4b492ed98173e0a63c1062
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which appear to be part of an SEO link farm designed to redirect users to potentially malicious content. The presence of a critical ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicates malicious intent. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is used to drive traffic to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?utm_term=assamese+song+new+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452852/normal_603def5ed6c7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380854/normal_6057083de0337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450421/normal_6050d83bed5ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471236/normal_600d42bc1e911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_602611056c1e7.pdfIn PDF document text
    • https://bojijoda.weebly.com/uploads/1/3/5/3/135325587/lirawopek.pdfIn PDF document text
    • https://cdn.sqhk.co/zixagiko/ii6nzMt/sojoxositixegeromagun.pdfIn PDF document text
    • https://cdn.sqhk.co/wanazofemuvu/Qhe7iiq/18197045966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457843/normal_600abb3316d83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486984/normal_5ffbaca1411b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481163/normal_6042cbc466139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470968/normal_602e58d0c58bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372682/normal_60520d8b8cde0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408355/normal_5ff16dd43915f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448536/normal_6023677d4642c.pdfIn PDF document text
    • https://funesovikigaje.weebly.com/uploads/1/3/0/7/130740183/wewasufatanasi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420760/normal_60163bf77bd2c.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/hajhicZ/british_superbike_2020_schedule.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467017/normal_5fdda4733c08c.pdfIn PDF document text
    • https://cdn.sqhk.co/rarukaboz/jfDgchi/36182491091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392871/normal_603e8ee573bcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_60294671f2cab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_601ed1d005496.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 5440 bytes
SHA-256: 095ca6b22326de5d1848e3d2d66487f5d2e54029aa49c7c9e39452d6461ea7d6
font_01_sfnt_off0001074c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074C 10796 bytes
SHA-256: 06ecad5035d2332a92ef6aa566841c8c0f3ef9dd4e3162523924a2df95179c40