Malicious PDF — malware analysis report

Static analysis result for SHA-256 628359dfa819dbc3…

MALICIOUS

PDF

79.8 KB Created: 2021-04-04 06:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5b10caf61b1ea03a5e4f28c1ee27b056 SHA-1: 2562a69589acd4ca5b053875a345d5d8d51c7141 SHA-256: 628359dfa819dbc31ba9f131458c1817a80d75e074bd014a9eb003f7a2fcc4c9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to suspicious or unknown domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains keywords related to software cracks and potentially misleading content, aligning with common phishing lures.

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://maypoin.ru/wix?keyword=rosetta+stone+torrent+crack PDF link annotation
    • http://nugowimabu.mywebcommunity.org/livro_arquetipos_helio_couto.pdfIn PDF document text
    • https://rumunalitivera.weebly.com/uploads/1/3/4/0/134041361/072212eee1f13.pdfIn PDF document text
    • http://maewallace.com/animal_research_worksheetlgjsi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469863/normal_6036a568010ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447273/normal_6035e2bd2f91a.pdfIn PDF document text
    • http://jurojegame.getenjoyment.net/58334819049.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_60686d787da90.pdfIn PDF document text
    • https://mijezuri.weebly.com/uploads/1/3/0/9/130969422/kexoloziviri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456671/normal_602d4c6b1aed2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_606629571fd6c.pdfIn PDF document text
    • http://7evenrp.ru/95958693626hfrx7.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/lukepepe/5310552954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a47f378-5f31-4d7f-a88f-7206d0751f54/english_speaking_classes_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16105a8c-127c-4241-bdec-519844379829/73174187480.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/dewofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a638e7be-5e01-48ef-a461-4355a96ab1da/how_much_to_rent_a_tux_for_a_wedding.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/jopigavomowojelujogemuf.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/99037576155.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_off0000e38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38A 4572 bytes
SHA-256: 46d8a6476deb19bcf1dc8a63e9a9ad3717ac83c83958ba7d7fada266ca3b358d
font_01_sfnt_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 15168 bytes
SHA-256: c18d13523dc8dff271ff5431521ad412a1e5017c01069ab74ec5fb45456e7bc8
font_02_sfnt_off000121e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E5 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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