Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcf50e6be647a72…

MALICIOUS

PDF

70.7 KB Created: 2021-06-08 18:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 65d1ce8bc4154c4498b7b21d7bfeae75 SHA-1: bb104fd93f4a53b29dfc2800595a6549f77064e1 SHA-256: 9dcf50e6be647a72044a6492e1426cdcbdd51d13b8f94d1489aaaa9479cdd397
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The embedded URLs, such as 'https://ketchas.ru/pbw?utm_term=mini+militia+hack+ios', are likely part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ketchas.ru/pbw?utm_term=mini+militia+hack+ios PDF link annotation
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/rusim-xofufujarimuva.pdfIn PDF document text
    • https://sukevimekixav.weebly.com/uploads/1/3/4/5/134599702/wagomegobu-kivunavix.pdfIn PDF document text
    • https://rafafokisot.weebly.com/uploads/1/3/4/7/134738004/rotowonuw.pdfIn PDF document text
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/guzatuzowiwo.pdfIn PDF document text
    • https://vabebixeteguju.weebly.com/uploads/1/3/4/2/134234611/dofevipajome_xajedikefosozik_vemibab_pudewufiz.pdfIn PDF document text
    • https://kitetunevoneg.weebly.com/uploads/1/3/4/7/134703129/efa55e15.pdfIn PDF document text
    • https://wisokovunali.weebly.com/uploads/1/3/6/0/136051549/raniwijulamu_vorunoxusaz_tivexamu_liruruvetizaguv.pdfIn PDF document text
    • https://gesivakegozuk.weebly.com/uploads/1/3/4/7/134768451/6122891.pdfIn PDF document text
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/kupusetutufolu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451945/normal_5ff5ecd9be876.pdfIn PDF document text
    • https://nipibodofabujid.weebly.com/uploads/1/3/4/2/134265940/gaxosawivipejagevezi.pdfIn PDF document text
    • https://xadibepewi.weebly.com/uploads/1/3/4/4/134447443/napuleba_tezutuxixoto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454167/normal_5fe0899f731b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_6033fcc9184a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/15dd810b-573a-4208-a40b-e29f9faced99/acids_and_bases_reading_comprehension_worksheets.pdfIn PDF document text
    • http://didaneguk.pbworks.com/w/file/fetch/144783561/daraxasinudutisute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69585579-f44d-4b8f-bd08-cce403bad159/27010353581.pdfIn PDF document text
    • http://gazumadu.pbworks.com/f/bharat_acharya_videos_free_download.pdfIn PDF document text
    • http://nusometa.pbworks.com/w/file/fetch/144696174/20453179583.pdfIn PDF document text
    • http://polubisoxuwo.pbworks.com/w/file/fetch/144825702/bloons_monkey_city_mod_apk_android_1.pdfIn PDF document text
    • http://fubajulak.pbworks.com/f/bitlocker_recovery_password_viewer_and_bitlocker_drive_encryption_tools.pdfIn 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_off0000e011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE011 5012 bytes
SHA-256: 52e991a299e4da1b57682e1a17a61d63fe71355c01c9e111ce81bf7e3dfe0702
font_01_sfnt_off0000f0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 10784 bytes
SHA-256: e539412c70de3e6a908e67d7104836f907e66ffe345673a1f70f835e792b1c56

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