Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bee4a86f96d8d14…

MALICIOUS

PDF

67.9 KB Created: 2020-12-23 20:20:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 27d70a3fbcb720477cc33d45fed75ea2 SHA-1: b4b87f99b3be0a6c5709b0e19e54753a73b04555 SHA-256: 7bee4a86f96d8d1419a3b201162446b716456e048713bcda2b9751779f94e668
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trafffe.ru/strik?utm_term=jio+prime+membership+recharge+plans PDF link annotation
    • https://nunodovov.weebly.com/uploads/1/3/1/3/131380210/ranupewu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466370/normal_5fa74d93de276.pdfIn PDF document text
    • https://cdn.sqhk.co/kupemopo/Ogieghc/93795476238.pdfIn PDF document text
    • https://cdn.sqhk.co/muruwake/MgiIloi/nba_2k20_player_ratings_all_time.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415291/normal_5fe0f7c6ec60a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387807/normal_5fa51f8331051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491936/normal_5fb6acc5f1cc4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e22c7ed-5d1e-4d92-b369-07a4e097204f/32470161150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c31a4c9-a4ed-4f36-abed-a9f78c633d8f/58216980822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7732039c-7be8-4850-8715-ad9e9fa27d72/potijetumafifutijekisuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/mowifuduvizaniwido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7e59794-490d-4f86-a97a-eb6febef6a82/denexenazoz.pdfIn 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_off0000cb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 5476 bytes
SHA-256: e63d5a257e31ed74106e1f260ec8c8fd9dfa0b9f99ac944d1f6d8d69c12f44dc
font_01_sfnt_off0000dd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD87 10992 bytes
SHA-256: 3a3ef142d625bffdc34125222d3557d245660d55d5b9bb32d9686694dc72691f

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