Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdae3d05151d4e8…

MALICIOUS

PDF

75.2 KB Created: 2021-03-09 19:02:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 70c7a1bee51c4f16826ae77da8ba474a SHA-1: 796fbf42bc2a769e8680ddfa7a4b6436f1784488 SHA-256: 4bdae3d05151d4e8b2303ad650a2042e995d4712a692540764ff341516a3f6ac
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a primary focus on directing users to 'fokemale.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a malicious intent to distribute further payloads or conduct phishing. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious classification. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=english+bulldog+pumpkin+carving+stencil PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412887/normal_60437c3c93b2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411701/normal_601a87955d398.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427523/normal_60110f27b956a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368225/normal_5fe50fa2c1ee7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473902/normal_5fe7955c18570.pdfIn PDF document text
    • http://sabovibin.medianewsonline.com/pulezopefolojofivatura.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vitivagi.rf.gd/95760931555.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/free_california_lease_agreement_template.pdfIn PDF document text
    • http://sokobob.epizy.com/gogetasifolafatewib.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/free_pokemon_fire_red_emulator.pdfIn PDF document text
    • https://3df06c22-1e8a-4082-8cc2-a0fdc0609706.filesusr.com/ugd/d86e81_7004a2f942cb4f00941272eadaceba72.pdf?index=trueIn PDF document text
    • http://ruruwuvatokatal.onlinewebshop.net/interesting_writing_prompts_for_high_school.pdfIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_15d2464a4c6f4ca78a77874bc6ca513d.pdf?index=trueIn PDF document text
    • http://pejemevogoge.myartsonline.com/basic_calculus_grade_11_deped_tambayan.pdfIn PDF document text
    • http://lamupimifuban.onlinewebshop.net/what_can_alexa_do_on_fire_tv.pdfIn PDF document text
    • http://likutolejit.onlinewebshop.net/lovigomumisasoxumozarinu.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/22721994150.pdfIn PDF document text
    • http://subogerilazelo.atwebpages.com/nfhs_track_and_field_rules.pdfIn PDF document text
    • http://pumejusatojajeg.rf.gd/vematozu.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/fojef.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_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 5708 bytes
SHA-256: fb14e3954aaa07d6a5ebc58431361f71dc94ac395f5c50680fb29691a5999f7e
font_01_sfnt_off0000fc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 10248 bytes
SHA-256: 1c28822fde59ee15c0276d39adc0544726352965d08cf57980142c0ea87d70c5

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