Malicious PDF — malware analysis report

Static analysis result for SHA-256 936fffaa7d0448f8…

MALICIOUS

PDF

82.4 KB Created: 2021-03-14 01:47:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b7b80cac71c24c276150531478d0d90d SHA-1: ad75e25b6886f595b99b5061eeeac9162d8643eb SHA-256: 936fffaa7d0448f8b6fa6904e3b066db30df39963f8e9acd8b2567704e9c60c6
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs and the document's apparent purpose suggest it's a phishing lure, likely attempting to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself contains links that are indicative of a phishing attack.

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://bologen.ru/award?keyword=beauty+and+the+beast+disney+story+book+pdf PDF link annotation
    • http://evromotors.net/latibeziwipidapaleparappss8l.pdfIn PDF document text
    • http://mattelipsticks.site/39367060584171mu.pdfIn PDF document text
    • http://brandframeb.com/403378827045x6f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5fe8806031fdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481527/normal_600ec1db794ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417423/normal_5fe0fc7d1e863.pdfIn PDF document text
    • http://superheatbelt.xyz/ralusulosozajimajitalel17v6.pdfIn PDF document text
    • http://tophomework.space/full_wave_rectifier_lab_report_conclusionr3oj7.pdfIn PDF document text
    • http://nobirejajatit.iblogger.org/38660506340.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454422/normal_5fef6c9973c84.pdfIn PDF document text
    • http://denizan.com/fonubixuly3pbi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465151/normal_602ad434eaa62.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/semuxemakaw/tokorofumoburibozifo.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/niwenifodud.pdfIn PDF document text
    • http://lizaxuru.rf.gd/what_is_chemotherapy_for_cancer.pdfIn PDF document text
    • http://jitofatukawej.rf.gd/all_english_grammar_rules_for_competitive_exams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d1913c0-1158-47e3-a478-62ffaff0ef0f/will_there_be_another_stock_market_crash_in_2020.pdfIn PDF document text
    • http://vetoliwageje.rf.gd/the_presentation_of_the_self_in_everyday_life_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1ac20da-e62c-43d1-9f61-56714b93305b/33205092966.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_off0000f543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF543 5332 bytes
SHA-256: 42eb41695fcaaf30f2f2c9b52fce07a050d375d14158764415c4f87c7f2afb00
font_01_sfnt_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 11452 bytes
SHA-256: 155a1ff5722ded91a32f68867c34380131b79edb3f33d4f9b4bdc358bbae0470
font_02_sfnt_off00012e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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