Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d072a601f39a8a…

MALICIOUS

PDF

99.8 KB Created: 2021-03-16 07:34:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 371da5b54618e82678664afdd24d81ce SHA-1: b4e959c5476323f6ff22694d29f79190c856ce29 SHA-256: 75d072a601f39a8a59c1582baf8248997d6391045d46cbf6102c85de9c2bf5cc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=github+cheat+sheet-+ai PDF link annotation
    • https://cdn.sqhk.co/rapowipijes/wIghjaO/4386012317.pdfIn PDF document text
    • https://cdn.sqhk.co/buvovemif/ijegiwe/nice_guidelines_ctg_2001.pdfIn PDF document text
    • https://nizifaweneli.weebly.com/uploads/1/3/4/5/134589853/bedaxuxeni.pdfIn PDF document text
    • https://xoregofejaba.weebly.com/uploads/1/3/4/6/134651656/a10683e3.pdfIn PDF document text
    • https://gagopono.weebly.com/uploads/1/3/2/6/132681316/26845943.pdfIn PDF document text
    • https://latiniwujuxemuw.weebly.com/uploads/1/3/3/9/133997677/2288f5db294d86.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/idiajjM/tolajijodo.pdfIn PDF document text
    • https://jaluwaxigesife.weebly.com/uploads/1/3/4/6/134640648/gapopimuk_miseziripuw_gefunad.pdfIn PDF document text
    • https://vojimefijizudi.weebly.com/uploads/1/3/4/3/134310580/tupirinuzel-mifonej-lofejupex-ditunalor.pdfIn PDF document text
    • https://cdn.sqhk.co/zoribakim/2J1m6ig/wwe_smackdown_vs_raw_2007_roster.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/qjijgSv/speedometer_not_working_and_transmission_not_shifting.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/6cf07a66-c7ba-4580-a0dc-24508a0d352d/gopedubaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a423e58-9097-43e4-bfb0-e495def7e12a/coleman_inflatable_hot_tub_filters.pdfIn PDF document text
    • http://zodenowukafowe.rf.gd/94249268147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f7f283-882c-43c2-9c9e-207a9d9801e8/tavupewitejogeluxoferow.pdfIn PDF document text
    • http://fujesotes.epizy.com/76521549208.pdfIn PDF document text
    • http://mezoninol.epizy.com/lab_safety_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA6 2912 bytes
SHA-256: 1baa3efd180cf5f44d613abe34ea0380c2d25dd221f4ef864ac418d56f73cc35
font_01_sfnt_off00014702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14702 4964 bytes
SHA-256: 03a6ef58936c58d545562287a57aaf9a13a38a725018269110db99307bceaf13
font_02_sfnt_off000157ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157EF 12484 bytes
SHA-256: 0f50e76b2e6a081c5fdf117d970dbb9e3f6a78fd246ce8ce3f817ad35dcd89f7

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