Malicious PDF — malware analysis report

Static analysis result for SHA-256 856a9c61a9974fa1…

MALICIOUS

PDF

81.2 KB Created: 2021-03-16 07:01:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7659eec73a2d95834d10e63d4a0cf074 SHA-1: c09289719b1906aaffc2c17b9012f334ca49bf0e SHA-256: 856a9c61a9974fa19f3a85eb7c66c90da65a9eda67607fdf8925c7487f35b3e1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/award?keyword=catecismo+da+igreja+cat%25C3%25B3lica+completo+em+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372707/normal_600bd8a764619.pdfIn PDF document text
    • http://mizarofu.22web.org/anatomy_of_human_body_book_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457620/normal_5ff23bae93235.pdfIn PDF document text
    • http://vesixadaw.22web.org/30681536798.pdfIn PDF document text
    • http://durasazi.iblogger.org/simile_metaphor_personification_hyperbole.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471099/normal_5fc773545f3cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407576/normal_604b94007bf6c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://midawosejidebov.epizy.com/98700197792.pdfIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_f76ae6143a494570a260de5232840c3d.pdf?index=trueIn PDF document text
    • http://nixozokusujuku.epizy.com/51269897927.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/88240315461.pdfIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_6403629591244ac99383006f9fa8266b.pdf?index=trueIn PDF document text
    • http://zosofoladi.rf.gd/fekanofidabe.pdfIn PDF document text
    • http://wijuromosumeko.rf.gd/59614078707.pdfIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_0b99b0cb0d964a34940a8adb95928795.pdf?index=trueIn PDF document text
    • http://dolufin.epizy.com/damuvuniko.pdfIn PDF document text
    • http://nosenek.epizy.com/wibidozori.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/87042676104.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/heartworm_treatment_guidelines_dogs.pdfIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_af48cf07d9b94fd5b34b4e7bbc36d44d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovibu/greedfall_ign_guide.pdfIn PDF document text
    • http://jurolabadujo.rf.gd/bnz_kiwisaver_financial_hardship_form.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_off0000fa55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 5592 bytes
SHA-256: 2905a4e94f673f5940a5e2c48c7b7e15371ace5a6449a00fdbcd73b6fd688122
font_01_sfnt_off00010d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D04 13852 bytes
SHA-256: b38f4b625a99745fd86127db254165ae889c3ab4c7cb1ee024b6466c1459aaf4

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