Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fabb32675bff23e…

MALICIOUS

PDF

75.3 KB Created: 2021-02-16 09:29:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e1956dd8174cf62e7975b574d807dcd0 SHA-1: 057d43911ee2de86e226838195af471cbb16c1f7 SHA-256: 6fabb32675bff23e3d688e509ab610e7065c4439b57ff067dba3d420eb94d3fc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs, including one with a 'utm_term' parameter, points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/strik?utm_term=arduino+tutorial+32 PDF link annotation
    • http://xeresorejal.iblogger.org/kewuvetiditaxekexir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_601387604b3a5.pdfIn PDF document text
    • https://xidelesa.weebly.com/uploads/1/3/4/4/134498911/vefujuzi-vunusuvopu.pdfIn PDF document text
    • http://kernig.online/998392728391uywz.pdfIn PDF document text
    • https://cdn.sqhk.co/laxefotogulo/cpCIFvc/rilen.pdfIn PDF document text
    • http://netzamka.ru/bosakuzodadukewekelorop0h76n.pdfIn PDF document text
    • https://cdn.sqhk.co/pesenexur/bwjeUic/vubatovozozixakij.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/bXYYve0/41812082390.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403404/normal_60109fe282e8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407795/normal_6007a40972b5a.pdfIn PDF document text
    • http://doordash.fun/9426084715pm31m.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/egehcnC/discover_card_mobile_deposit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456121/normal_5fc963db6899e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384484/normal_60174001956ee.pdfIn PDF document text
    • http://aires.fun/mixed_perfect_tenses_worksheets19ivw.pdfIn PDF document text
    • https://vufujisuwe.weebly.com/uploads/1/3/1/4/131437295/2f8027e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://desiwafinu.epizy.com/materialize_templates_free.pdfIn PDF document text
    • http://zozezad.epizy.com/wezusomitapezagalikes.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_off0000df6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 3016 bytes
SHA-256: 388c3b3a9b538286831b3bbaffc91053f62a8850440e0365063d154e50750812
font_01_sfnt_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 4928 bytes
SHA-256: f862da11fd416c79db8dd7a8175db8ed75f59b1aeb1e78a461f30a52eacc997e
font_02_sfnt_off0000fafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 11060 bytes
SHA-256: f8aa0713d8efb94ec9700af3de91e0c72f29934b923d54a40d0c204038043f9f

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