Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8980de278364389…

MALICIOUS

PDF

66.2 KB Created: 2020-11-10 11:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0eaf73e382eefc588d95889618ee04cc SHA-1: dac8da736fd2d935f57e06eb93c74b5d90b2cca9 SHA-256: a8980de2783643891ade9620ff4d13ab5f76dad0776ef55d0c95f517045151c6
186 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. 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.
  • 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://trafffi.ru/strik?keyword=abolitionist+movement+pbs PDF link annotation
    • https://zonilalafujagep.weebly.com/uploads/1/3/4/7/134731182/1913414.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/e95663c62b39.pdfIn PDF document text
    • https://zoditivifu.weebly.com/uploads/1/3/4/3/134316547/4838211.pdfIn PDF document text
    • https://nugekepujipa.weebly.com/uploads/1/3/4/3/134318644/3836684.pdfIn PDF document text
    • https://xiwitewikilimav.weebly.com/uploads/1/3/4/3/134371529/5deefb7.pdfIn PDF document text
    • https://xekixudag.weebly.com/uploads/1/3/4/3/134336078/guwinukozugijad-dusexif-zomopixix-lekilifa.pdfIn PDF document text
    • https://pudukodup.weebly.com/uploads/1/3/1/4/131407572/781e0452842a4.pdfIn PDF document text
    • https://sowubibuf.weebly.com/uploads/1/3/4/3/134308786/metekujafuka-wirimul.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/9828742f-7416-4930-8c82-3ebc686f2799/putting_out_system_upsc.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/wudotixeleleliboroxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb9280f6-34bd-4dd8-97c4-b31393743c9c/16685979596.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_off0000c804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC804 4848 bytes
SHA-256: 2645c7974cd34f80f6856d2ef2b40935316aa16af933b8dfcd116f3921ab543c
font_01_sfnt_off0000d878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 10040 bytes
SHA-256: ff65c5f3b68cbf6de0bd3ff78a5b214c5631e517239cd6d47b2991e7e5947bae

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