Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09a415af3d3ae90…

MALICIOUS

PDF

77.9 KB Created: 2021-02-19 18:51:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 7146b814a1abbb760042d7fe0547d52f SHA-1: 7f9b72dfe2f1fcfa98146fc2b15ecc4ff210ad79 SHA-256: a09a415af3d3ae9082f585a24800f440690fd0078cff773260a681077e0a528e
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and configured with UTM parameters, suggesting a link farm or redirector. The document body, though heavily obfuscated, contains text related to financial queries, likely a lure to engage the user and encourage clicking the malicious links.

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=how+much+did+michael+burry+make+in+2008 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492892/normal_600ce22cb69a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391308/normal_601da38640c1c.pdfIn PDF document text
    • http://housefashion.ru/believe_polar_express_piano_sheet_musicg8xag.pdfIn PDF document text
    • http://arnautmebel.ru/73238232053f0u6m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366359/normal_602b5b691fef4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466367/normal_600e21753ddc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_600f77a94956b.pdfIn PDF document text
    • http://help-service-support.com/alice_walker_everyday_use_analysiswwyab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416786/normal_602be9abe9dbb.pdfIn PDF document text
    • http://extrameets.fun/dorothy_perkins_size_guide_europe62j4h.pdfIn PDF document text
    • http://bazis-rostov.com/78002539222ubwyp.pdfIn PDF document text
    • http://obuv-kozha.ru/hernia_inguinalis_indonesia3z33k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494889/normal_5ff4cdd285480.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480382/normal_5ffd639cc321f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/savifin/pisorofojokiluko.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/49291040808.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/parametric_equalizer_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/kikinasixerelumajaxutozi.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/kovoxijibozixakerimoked.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_off0000e31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31F 5632 bytes
SHA-256: 3adaca074bd7aa1e0844501ac275b364442f5f999439eba9ab910210fa069dc9
font_01_sfnt_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 10984 bytes
SHA-256: ba1f88a1168cc274ee98a8a27d40563e95a3960a58f74141932cfa38af6158be
font_02_sfnt_off00011b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B63 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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