Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c82a2a4197fd8f3…

MALICIOUS

PDF

84.4 KB Created: 2021-03-23 00:49:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 485b14fa1ccd5ff77c97987b343aaee6 SHA-1: eec5d41794ffe8ce98fd9517ba2c65802d4e3bf8 SHA-256: 0c82a2a4197fd8f3cc684ca3652504989ca02f3321ecdd4f87d792d375557936
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. One of the embedded URIs, 'https://midufefew.ru/wix?keyword=savannah+library+jobs', is flagged as suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/wix?keyword=savannah+library+jobs
    • https://fogojokiverowur.weebly.com/uploads/1/3/0/9/130969702/wolepipulu_mekejo_nupotomel.pdf
    • https://static.s123-cdn-static.com/uploads/4451762/normal_5fe4a403f25f5.pdf
    • https://static.s123-cdn-static.com/uploads/4457560/normal_5ff61ab8ce4f3.pdf
    • https://static.s123-cdn-static.com/uploads/4401973/normal_5fecc9b1d4cfd.pdf
    • https://zevuvizaxetu.weebly.com/uploads/1/3/4/8/134887967/piwiberulefe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b5217161-1847-406f-923c-93760015c62a/83945682559.pdf
    • https://s3.amazonaws.com/mejobu/vivaven.pdf
    • https://s3.amazonaws.com/jemisajoda/carry_on_jatta_2_official_trailer.pdf
    • https://s3.amazonaws.com/tetofamuxulil/bitim.pdf
    • https://uploads.strikinglycdn.com/files/07afbffa-f62c-4133-b7a2-06cb425ae326/zajimuxalu.pdf
    • https://uploads.strikinglycdn.com/files/efae4054-655a-4dbd-9db8-d41d73dac5f8/nalenokusinuduwava.pdf
    • https://uploads.strikinglycdn.com/files/b6e91d33-72db-49a2-83e8-1b038dadbc54/22207781941.pdf
    • https://uploads.strikinglycdn.com/files/605809dc-20cb-4271-b8c7-511ed6ddb839/vojavij.pdf
    • https://uploads.strikinglycdn.com/files/8b0914d3-b750-49c3-8159-0ebdade5e5c0/gujaxerunitosone.pdf
    • https://uploads.strikinglycdn.com/files/a3e65e3d-6b63-457d-a837-2e46d907b7f3/writing_with_style_trimble_chapter_3.pdf
    • https://uploads.strikinglycdn.com/files/dd6adce1-3b57-4147-b678-31df80ee5f55/pemulizosazawevowilojag.pdf
    • https://uploads.strikinglycdn.com/files/4386a86d-8c49-46e7-948a-7436c8bd67a9/62093232382.pdf
    • https://uploads.strikinglycdn.com/files/b2fab8d4-9590-4975-a186-f78e6dc7fee4/skyrim_where_to_find_slow_time_shout.pdf
    • https://s3.amazonaws.com/leributafa/on_my_way_song_lyrics_file.pdf
    • https://uploads.strikinglycdn.com/files/d208b939-eaf9-4d50-96c8-0d29f9d25293/27991813512.pdf
    • https://uploads.strikinglycdn.com/files/70de0580-1472-4557-b1e9-72542023cf23/tu_puedes_sanar_tu_vida_louise_hay_gratis.pdf
    • https://uploads.strikinglycdn.com/files/5244258c-429a-42be-b376-07f71eada40a/89848530309.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c30.bin
42e9c19376b9e49cee7d5842b4138381f46f463b1e7b6a5e8dbca17a54ff8d90
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C30 5252 bytes
font_01_sfnt_off00011e15.bin
04705e2f0fe7396e8ce98bb9801b90add714add31d43847ab264a6097a415c6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E15 11352 bytes