Malicious PDF — malware analysis report

Static analysis result for SHA-256 d644329867c44665…

MALICIOUS

PDF

102.6 KB Created: 2021-04-04 03:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 295e84c235a840a09752b1cbdb9641ee SHA-1: 23de72e6647c7a33cf189626be97cbf441e2ad88 SHA-256: d644329867c4466536b21276dd93757d6825bd33385eb7992c5d5a00a6f28bff
134 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as an external URI pointing to a suspicious domain ('jottigo.ru'). The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for numerous links, suggesting an attempt to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jottigo.ru/award?keyword=low+back+strengthening+pdf PDF link annotation
    • http://jurinijija.22web.org/the_economist_style_guide_epub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413718/normal_5fd1bb9814d27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475729/normal_5fcd35dcf0491.pdfIn PDF document text
    • https://gixapogaruxa.weebly.com/uploads/1/3/4/3/134331356/49520.pdfIn PDF document text
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/vuwazisujopakul.pdfIn PDF document text
    • https://vewevemeza.weebly.com/uploads/1/3/2/7/132741136/jikiponanopodonatug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448121/normal_5fdd8f9b3e696.pdfIn PDF document text
    • http://maewallace.com/zilito037sa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366660/normal_5fcbe45449d62.pdfIn PDF document text
    • http://instasavephoto.com/28556655672hczhu.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://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_9d9ecde081024233999f04cc01be43d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8276169-97f6-4de5-b5f0-ed787b856d14/how_to_clean_a_smoke_machine.pdfIn PDF document text
    • http://puxakuxuvon.epizy.com/invitation_size_guide.pdfIn PDF document text
    • http://riboparewi.rf.gd/how_to_write_better_copy_steve_harrison.pdfIn PDF document text
    • http://tuxusar.epizy.com/honda_rancher_es_carburetor_adjustment.pdfIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_4e667bc38ad14c12bb6286eae4a79fda.pdf?index=trueIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_9b8f6f8d1f23493687e088fdbe03d2eb.pdf?index=trueIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_8f1b65e0540947ccb85ca2d03d4cdccf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/99903d0d-4a8d-409c-971b-9d42efea9542/56130998138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bca9fa38-4f04-41be-a9a8-5a408b7a6eca/famopozixixur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7ad3c74-3428-45cd-afc4-e242c9fa57be/68060086145.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_off000143fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143FC 5412 bytes
SHA-256: 85d478ec8754bbbea3fe00d05ec36790be2c5a46a33f795c38f7cf6d9f89aec8
font_01_sfnt_off00015663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15663 11924 bytes
SHA-256: 55eb60a871f4186cb0b5d915db00192106a88bf4fb02951708ff899f08676b66
font_02_sfnt_off00017f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F14 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378