Malicious PDF — malware analysis report

Static analysis result for SHA-256 84213043c92dd76f…

MALICIOUS

PDF

92.8 KB Created: 2021-03-15 20:31:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b23bc684cf1b2088ffdec1c3770c985a SHA-1: 2dc1c5f085a8189fb0b27c17b9b85f86f7b76e35 SHA-256: 84213043c92dd76f51d3420c47eb4edde8433430ad5e2c01303da554c95fc09b
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to host phishing content or redirect to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure malicious links. No scripts were extracted, but the overall structure and heuristics point to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/aws?utm_term=tom+clancy+jack+ryan+universe+books+in+order PDF link annotation
    • http://tacfitproducts.com/robocopy_orden_para_copiar_archivos2cj0k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422637/normal_5ff7ba814ab5e.pdfIn PDF document text
    • http://zarewubizeno.mywebcommunity.org/bldc_motor_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454287/normal_601f92bf7f4a4.pdfIn PDF document text
    • http://susurrus.space/nibuferarozeglp03s.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/dijotinimujabis.pdfIn PDF document text
    • http://eslife.pro/how_to_fix_a_faucet_that_leaks8746y.pdfIn PDF document text
    • http://magexaxajatadog.getenjoyment.net/24932600757.pdfIn PDF document text
    • http://gaxesujite.medianewsonline.com/womens_evil_witch_costume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486522/normal_6039ea77a05dc.pdfIn PDF document text
    • http://vosojivaru.mypressonline.com/63865392735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489052/normal_601a3b8f2e0a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478670/normal_6048f27878459.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/how_to_connect_backbeat_fit_to_computer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bibezakomi.myartsonline.com/cat_s_eye_margaret_atwood_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2886a5f5-f6b4-4488-bd2b-f5320e344230/dabopoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df1a45c7-5882-4f91-87f9-3fd06c8c7c73/mary_poppins_5_book_set.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57007b98-8040-40dc-9b50-6d7ead18cee7/38470184046.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/81885867693.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/construction_technical_specification.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_off00012d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D58 5476 bytes
SHA-256: a93f01d049b38e78b08bb5e5b0c9f6388c2ad25b3f9e0c67ee5bb969da52f039
font_01_sfnt_off00013ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF7 11108 bytes
SHA-256: 0ed8488d18c027e0c3fef57a458f111b9f7c92c4734369a6b3d404a13fb20b35

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