Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a9f51cd676028d…

MALICIOUS

PDF

69.1 KB Created: 2020-12-28 00:50:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ebdb4fbe23baa26b1c0df744459ada4e SHA-1: 4e2119603e1d67dca782cd452ef752b37e54cb3e SHA-256: 05a9f51cd676028d57ce3b98435b2af50b2a73e49419cda8734f46dc7c781d7d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. The primary URL, 'https://trafffi.ru/123?utm_term=summoners+war+account+reset', suggests a phishing attempt related to game account resets. The document body, though heavily corrupted, contains fragments related to 'Summoners war account reset', reinforcing the phishing lure. No scripts were extracted, but the presence of external links and the overall detection indicate a phishing campaign.

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://trafffi.ru/123?utm_term=summoners+war+account+reset PDF link annotation
    • https://mafexanilexa.weebly.com/uploads/1/3/0/7/130739060/066b5c8d84b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_5f8fb2ef411f2.pdfIn PDF document text
    • https://rixokofumi.weebly.com/uploads/1/3/1/3/131380985/1985869.pdfIn PDF document text
    • https://tebefatudu.weebly.com/uploads/1/3/4/3/134329870/e6f25.pdfIn PDF document text
    • https://kevegojap.weebly.com/uploads/1/3/4/8/134863313/ragupejogodiw.pdfIn PDF document text
    • https://zanasebumafuwaj.weebly.com/uploads/1/3/4/8/134899829/bipusigarilimi-xatukenafov-legulujake-nabadudurof.pdfIn PDF document text
    • https://rovufeku.weebly.com/uploads/1/3/4/6/134636625/487fa2b6f8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418575/normal_5fe90ec6d359d.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://uploads.strikinglycdn.com/files/739bddef-0a23-4408-8a1a-0ed1bb931a98/41222024120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/616c1a36-590a-4c0f-b8b8-7d37e5e20afa/56557147455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c742a8e-6e4d-47ce-840c-b08d461de28f/descargar_gta_san_andreas_para_android_mega.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_off0000c54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54F 4944 bytes
SHA-256: f22a03679bae941f63ffb625be5dccaa593d8c74b942ed87710a068da0c4a678
font_01_sfnt_off0000d5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FC 10404 bytes
SHA-256: 0d3bc35f19dc358c4e591c31e91b7e01ba8a07bfad8a27adbbb92ab4ba448c80
font_02_sfnt_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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