Malicious PDF — malware analysis report

Static analysis result for SHA-256 a516447b303b9699…

MALICIOUS

PDF

71.9 KB Created: 2021-03-03 16:35:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1c67b437dd0270d4523ace456c0ff667 SHA-1: 0edc8cc47aee3d6c61861d1b66713a516a322b78 SHA-256: a516447b303b9699571aacba4c2cb47987253c806f6116c38b672f95649c615c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document body, though obfuscated, appears to be a lure related to a gambling term, directing users to external sites that likely host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/award?keyword=what+does+double+down+mean+in+fanduel PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454043/normal_601e908892b22.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/what_is_the_meaning_of_the_word_hieroglyphics.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/89941308774.pdfIn PDF document text
    • https://cdn.sqhk.co/wawerugile/yhau9ih/ski_coat_mens.pdfIn PDF document text
    • http://reactivascotia2020.com/weekly_review_sheet_mathvpdz9.pdfIn PDF document text
    • http://terugate.mypressonline.com/49185318619.pdfIn PDF document text
    • http://wowogobofomufu.mygamesonline.org/roomba_960_parts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuvuzevo.atwebpages.com/what_are_the_responsibilities_of_a_teacher_in_a_preschool_classroom.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/how_much_is_a_box_of_romeo_and_juliet_cigars.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/the_prayer_of_jabez_audiobook_free.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_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 5296 bytes
SHA-256: 6fe4203623bdb80cfd5e4aced7cda8c078ab36fd1c6f2ecbf50d77b6dcb22d97
font_01_sfnt_off0000ec85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 10664 bytes
SHA-256: 0b68f230b5b7f55a33a12114adea3000241d1cb3d40faae65d7c7ee593c87656

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