Malicious PDF — malware analysis report

Static analysis result for SHA-256 85aaf318f0594779…

MALICIOUS

PDF

75.0 KB Created: 2021-03-26 07:07:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8545588d0a0242afd5d6bf2212864455 SHA-1: 954e16ef63cf5401c6d2ffb2f27ca2b98dd8e5bf SHA-256: 85aaf318f059477999779eff67ea1630bd93fca2a94e067623fb5ea2ae338f32
186 Risk Score

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 0.9999

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://maypoin.ru/strik?utm_term=vermont+castings+defiant+encore+models PDF link annotation
    • https://xozavefo.weebly.com/uploads/1/3/4/0/134018900/c908023f62c1e6.pdfIn PDF document text
    • https://dujajiworexu.weebly.com/uploads/1/3/4/8/134848881/283037451ba.pdfIn PDF document text
    • https://sukuwakutas.weebly.com/uploads/1/3/4/6/134603616/1217201.pdfIn PDF document text
    • https://cdn.sqhk.co/runolisor/idh4kha/40157828594.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvaratuji/Ngcgfhc/master_sculptor_eddie_lee.pdfIn PDF document text
    • https://nezivubu.weebly.com/uploads/1/3/1/3/131384481/8503880.pdfIn PDF document text
    • https://torusakewojowep.weebly.com/uploads/1/3/0/8/130814967/suzokuvedi.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuzobisu/ldXSgdL/tetris_99_how_many_players.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/pakuzomadekari.pdfIn PDF document text
    • https://cdn.sqhk.co/vopupevomate/hibiehc/19871508911.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/puwuvekuvipagifip.pdfIn PDF document text
    • https://vowagogo.weebly.com/uploads/1/3/5/3/135307183/9768808.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/wemupajese/35387649838.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/ashrae_handbook.pdfIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_98c0ea9fb24f4b228ba5e0710e14f310.pdf?index=trueIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_ff8553f0773e48bea19cc1c4a22d1c00.pdf?index=trueIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_6848dc53431b446e97cf26b36ebd5077.pdf?index=trueIn PDF document text
    • https://e668d0bc-6b9c-4787-ac64-5363b724ef62.filesusr.com/ugd/6ec699_cc54b77907b140ceb0f0855ff6d16a0c.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C3 5304 bytes
SHA-256: 848c01352e8c4d099d0c11d2b95b47a8fd46a216bd3df7372a3e463b0e1b7b4b
font_01_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 11264 bytes
SHA-256: be45da0c4096bc930a9b5e0cbf1db6aca93c98448c0ae18342e671c507d3cedc

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