Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8e3545670b4bc4…

MALICIOUS

PDF

82.1 KB Created: 2021-04-14 21:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 15347ac2977d799f027688171ee15d7e SHA-1: df9ebe30fb64b3b55b230de001f0557c953306d6 SHA-256: 2a8e3545670b4bc4c6e23370832bf786bd9c4c7908dce549c4db524e369af99f
126 Risk Score

Malware Insights

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

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent through URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://www.enwidth.com/sites/default/files/webform/resumes/58607877977.pdf In PDF document text
    • https://www.natsihwa.org.au/sites/default/files/webform/doxuwekuwazomiloxeri.pdfIn PDF document text
    • http://www.pbttphtk.gov.my/sites/default/files/webform/xaduxiwipel.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/talizovub.pdfIn PDF document text
    • http://russian-ice-spb.ru/sites/default/files/webform/files/42282539280.pdfIn PDF document text
    • http://russian-ice-spb.ru/sites/default/files/webform/files/loxigexaxezirizedud.pdfIn PDF document text
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/todoxobolukajit.pdfIn PDF document text
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/32710798707.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ronsard+quand+vous+serez+bien+vieille+analysePDF link annotation
    • https://printandmail.princeton.edu/system/files/webform/26360011081.pdfIn PDF document text
    • https://thesanfordschool.asu.edu/sites/default/files/webform/63066688876.pdfIn PDF document text
    • https://campusrec.princeton.edu/system/files/webform/rilawadabovoxilezevateg.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 5304 bytes
SHA-256: b9c7d4e321c308e59765f77f0941e98e45b019ed2b2f3e318c90979a33ea3064
font_01_sfnt_off0000ff56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF56 12580 bytes
SHA-256: bec14ddc718ccbb6a614934cae5c92a1668a3c4e02cc7912375f9a24f638a597
font_02_sfnt_off000126fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FB 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0

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