Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c96981ab5cee93c…

MALICIOUS

PDF

95.1 KB Created: 2021-01-18 10:21:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: afac5a8f43e0cd71774e092b42c6f83a SHA-1: d2bf77fb9cb31a5406540c79a3223ae922854054 SHA-256: 6c96981ab5cee93cdc8c7927406f6face6416589561e3bfc8f89f0eb17334527
186 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the primary external links, 'https://trafffe.ru/123?utm_term=land+before+time+petrie+uncle', is likely the malicious payload delivery URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=land+before+time+petrie+uncle PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f8a7f2f12682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369671/normal_5f9edced4bda2.pdfIn PDF document text
    • https://site-1177446.mozfiles.com/files/1177446/react_landing_page_template.pdfIn PDF document text
    • https://site-1178726.mozfiles.com/files/1178726/calendar_ortodox_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390664/normal_5fab214a1de67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368481/normal_5fc94f5126f82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404287/normal_5fb50e539b92a.pdfIn PDF document text
    • https://kelezisexuva.weebly.com/uploads/1/3/0/7/130739204/4128742.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370525/normal_5fcef55c4dfda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410985/normal_5fd0b164331c2.pdfIn PDF document text
    • https://fosakozetabu.weebly.com/uploads/1/3/1/4/131483491/4277621.pdfIn PDF document text
    • https://zonerizarom.weebly.com/uploads/1/3/4/3/134310007/6062332.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bidivo/dell_poweredge_t340_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/argumentation_beispieltext.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/15929464211.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/66971158709.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/musicians_institute_la.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_off00013992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13992 5204 bytes
SHA-256: 64fd112686ebb4d72e0e98d2f41086eee1ef9436abf998cf481129b2613674f4
font_01_sfnt_off00014b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B30 10696 bytes
SHA-256: 28ff80d26de0232e6ad659e195011e244d1fd5453179317abaa98fe357ad9ffb

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