Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a6b7516c22c707…

MALICIOUS

PDF

76.5 KB Created: 2021-03-25 01:14:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ee506190d35ab688f947ca8f3523522b SHA-1: e8d185763993a9ba379cba101fae0f6632d869f3 SHA-256: e3a6b7516c22c707bd9dfa7f87144d8f2cb808838e6d74568aab4b56e1ce5ca2
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, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one, 'https://mezovuduw.ru/award?keyword=simple+loan+agreement+sample+pdf', being directly associated with a heuristic indicating a link farm on disposable hosting. The document body, though heavily obfuscated, suggests a lure related to loan agreements, aligning with phishing tactics.

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://mezovuduw.ru/award?keyword=simple+loan+agreement+sample+pdf PDF link annotation
    • http://ligexekena.mywebcommunity.org/pexafegiwe.pdfIn PDF document text
    • http://0fruits.space/70164313865dlyxo.pdfIn PDF document text
    • https://terifurarogo.weebly.com/uploads/1/3/4/3/134317228/a62c7e2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408343/normal_5fd807e85c0fc.pdfIn PDF document text
    • https://kibasixeb.weebly.com/uploads/1/3/1/4/131438563/7620858.pdfIn PDF document text
    • http://dutarotanazosuv.medianewsonline.com/deep_water_summary_and_question_answers.pdfIn PDF document text
    • http://bnatural.space/video_maker_fx_kuyhaa5e8vj.pdfIn PDF document text
    • https://marulokovew.weebly.com/uploads/1/3/4/6/134611896/a62224e1521847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386606/normal_605b5ac84d6c6.pdfIn PDF document text
    • http://dotekebenutedex.scienceontheweb.net/7600265239.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494165/normal_5feb34ee01dca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/72fa1e10-f4de-4103-a265-7968bf1b66d8/my_name_is_red_critical_analysis.pdfIn PDF document text
    • https://e29f0852-aa8c-4fc4-a5db-fcd144ab7086.filesusr.com/ugd/b730be_25e988cbe0fb42a49efd3f5b80e03496.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_a3289acf2e26476f9d2e34c894eb1ef9.pdf?index=trueIn PDF document text
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_8d3df86b490a4f1f8f38eba0e2f64eae.pdf?index=trueIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_3756671e487c4f09a79afe8ca9c102f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8ce5edf-979d-44c4-9442-8602b4b8f052/22027422817.pdfIn PDF document text
    • https://19004eff-8f5e-45b0-b15a-9fbdbd99e39d.filesusr.com/ugd/578ea4_73af4686649b412498cb1dbd69c1d79b.pdf?index=trueIn PDF document text
    • http://dapufojutujat.atwebpages.com/burkitt_s_lymphoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dd9581f-084e-4107-b350-da088f96b1d7/xuzokowopiwoxukero.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_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 5464 bytes
SHA-256: b91b708b93fbd5129f9ad91dc2637cc93b28db319a7639c12cdd629e22d26c0f
font_01_sfnt_off0001009a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009A 10636 bytes
SHA-256: f5b12e9f5931665631084e570bc3a48efa5727785183f9b565a93c874d25451c

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