Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a5dd7e7cb78395…

MALICIOUS

PDF

62.9 KB Created: 2021-02-23 04:01:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4a89d8729837e9604f3e896c13aa5682 SHA-1: 1bb791361c3967a0637c8d7ca7967b459ba0619b SHA-256: 73a5dd7e7cb783954dbb41d94f739947f400acb0d569388f048cb271d7612c89
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and the overall structure point towards an attempt to redirect the user to malicious content.

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=vocabulary+workshop+level+a+answers+unit+11 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392661/normal_5fd0df22636a3.pdfIn PDF document text
    • http://autocredit.moscow/mositesufivomipusomokumitf8k98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494877/normal_60220ca297c04.pdfIn PDF document text
    • http://ranking-se.com/leavenworth_detention_center_inmate_search4blz8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502248/normal_5ff480663bbf3.pdfIn PDF document text
    • https://cdn.sqhk.co/dujagazatad/9iQMmic/33739619183.pdfIn PDF document text
    • https://wipusometava.weebly.com/uploads/1/3/4/8/134846349/8983473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464700/normal_601d7a43f3409.pdfIn PDF document text
    • https://viwefinorix.weebly.com/uploads/1/3/0/8/130813514/nazik-sabikesozujomip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383923/normal_6004394f01484.pdfIn PDF document text
    • http://classkaod.ru/nenapanoresufifyor3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412599/normal_5fc70e27bc64f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450506/normal_5fec73f2a4307.pdfIn PDF document text
    • http://mebets.xyz/where_to_buy_tv_bunny_ears_dragon_quest_11guer8.pdfIn PDF document text
    • https://nedotumawu.weebly.com/uploads/1/3/4/6/134626041/wuwiwif_dexegokibuke_xezijinomawuse.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445324/normal_5fffbf9f77705.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rawupegidozu.rf.gd/46195022380.pdfIn PDF document text
    • http://feruvemijajo.epizy.com/vovejumivowemofofada.pdfIn PDF document text
    • http://xoxijapemekiseg.epizy.com/day_of_infamy_speech_worksheet.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_off0000ba98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA98 5496 bytes
SHA-256: 6bd6b68098304a69e4b8a9811946cd769729f4def5e822b26273e8f6c9289e16
font_01_sfnt_off0000cd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD61 9636 bytes
SHA-256: 6259f123e1699b5511852e0fd2a1844df0e2656d833505dac96b780ab9072ae5

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