Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40b24201c216db9…

MALICIOUS

PDF

72.5 KB Created: 2021-02-28 04:07:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5b9faaf49f4df4081a054d8c880b1ee5 SHA-1: 24af25c19f3ea7999384c353cd9760568f72a80b SHA-256: a40b24201c216db953e86a85810c09b2dcd1745842ee329b3007ea27a3a7529b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable hosting or redirectors, indicating a link farm designed to distribute malicious content or phish for information. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this intent.

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://xajibur.ru/strik?utm_term=trane+furnace+humidifier+filters PDF link annotation
    • https://cdn.sqhk.co/tevunufoba/9zjbn6Z/fun_101_okey_hediye_kodu_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/simikitivo/giighjd/muziqlo_mobile_rhythm_game_download.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/explain_how_the_3_branches_of_government_work_together.pdfIn PDF document text
    • http://dikiwezuvejeve.iblogger.org/xogujofewotono.pdfIn PDF document text
    • https://cdn.sqhk.co/bowazeduz/jigchiM/sushi_catering_nyc.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/dhakhec/7640211643.pdfIn PDF document text
    • http://smartycredit.info/gumomr344z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370072/normal_5fd1416ba2bba.pdfIn PDF document text
    • http://stassikorskyi.com/allerton_garden_guided_tourqwcpo.pdfIn PDF document text
    • https://cdn.sqhk.co/parapirer/eBgfhi4/51264642439.pdfIn PDF document text
    • http://lefakumal.iblogger.org/68220504699.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/hoover_windtunnel_whole_house_rewind_belt.pdfIn PDF document text
    • http://jimarol.myartsonline.com/free_weight_training_for_beginners_female.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE25 5208 bytes
SHA-256: f4db71a3fee92a6780d1fe00626d86d7e78461f415a1d00aa2462675941ec05c
font_01_sfnt_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 11032 bytes
SHA-256: dacfe54c92ea68a839df7793bf55e46891b685e7ae938f4d4f50b2e532e54003

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