Malicious PDF — malware analysis report

Static analysis result for SHA-256 087f0285646720e8…

MALICIOUS

PDF

75.8 KB Created: 2021-06-12 23:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9363b3ff563c4edd86ee4b31fb088fe5 SHA-1: 75000a6e68448286475c5116854f99273a131cd9 SHA-256: 087f0285646720e82e7debcdc75b9cdabc2dde6bd945a69b767ad765e3367a63
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, with one prominent URL pointing to a link farm on pbworks.com, likely intended to redirect users to other malicious or SEO-abused content. The document body is heavily obfuscated and unreadable, suggesting it serves primarily as a container for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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
  • 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://laborke.ru/pbw?utm_term=film+after+passion+stream
    • https://dutumeparozawa.weebly.com/uploads/1/3/1/1/131163590/jutuput-nerimelisepemu-zepodefen.pdf
    • https://figeneluniw.weebly.com/uploads/1/3/4/8/134857588/0c2d669d8afee.pdf
    • https://rusipamisu.weebly.com/uploads/1/3/4/0/134017355/933115.pdf
    • https://xizoputi.weebly.com/uploads/1/3/4/6/134679655/mipejigis-xinasenopuni.pdf
    • https://sutuvawubu.weebly.com/uploads/1/3/6/0/136055635/gutibeleb.pdf
    • https://melajepanaxon.weebly.com/uploads/1/3/5/3/135398769/viwijatirifo-buvofi.pdf
    • https://pavejomesof.weebly.com/uploads/1/3/4/3/134310872/e840bc3336ac83.pdf
    • https://tobosuxonekid.weebly.com/uploads/1/3/4/4/134493818/b1c40d8a1.pdf
    • https://jibokogemi.weebly.com/uploads/1/3/4/7/134767321/pavotu.pdf
    • https://kosajovin.weebly.com/uploads/1/3/0/7/130739816/3269357.pdf
    • https://xezelugewopisaw.weebly.com/uploads/1/3/5/3/135311865/878d9ac3.pdf
    • https://nomikevokatipo.weebly.com/uploads/1/3/1/8/131859895/numozefawojijaxev.pdf
    • https://kumaneke.weebly.com/uploads/1/3/4/6/134682587/2284558.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rujuboxu.pbworks.com/f/pugeroxesabafipozuzogew.pdf
    • http://daxulesep.pbworks.com/w/file/fetch/144728526/char-broil_gas2coal_hybrid_grill_instructions.pdf
    • http://fijinatuzut.pbworks.com/f/76621089254.pdf
    • https://uploads.strikinglycdn.com/files/43e81436-700a-441f-82df-b008d375927b/totasesobovo.pdf
    • https://uploads.strikinglycdn.com/files/59f9208a-3ff8-4cda-869f-0f3aa5a2edfc/liposop.pdf
    • http://xugilip.pbworks.com/w/file/fetch/144507480/electric_circuits_10th_edition_nilsson_and_riedel_prentice_hall.pdf
    • https://uploads.strikinglycdn.com/files/5c6a5ac5-6606-4e4b-8de1-68f9885bf1a5/how_to_emulate_ps2_on_android.pdf
    • http://xuwedateredu.pbworks.com/f/app_download_vidmate_old_version.pdf
    • http://garewewaziwu.pbworks.com/w/file/fetch/144538215/holt_spanish_1_workbook_answer_chapter_5.pdf
    • https://uploads.strikinglycdn.com/files/1fc19bfb-afc3-466f-b62e-332077c1f937/how_to_write_acknowledgement_for_project_class_10.pdf
    • http://rabumofu.pbworks.com/f/lean_canvas_model.pdf
    • https://uploads.strikinglycdn.com/files/f80541b1-998f-44e9-8e61-e873f166a063/how_to_clean_your_krups_nespresso_machine.pdf
    • http://kiwuwas.pbworks.com/f/jakakoboku.pdf
    • http://zuxanuj.pbworks.com/w/file/fetch/144946206/dangal_telugu_songs_download.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_off0000e926.bin
e5460683d17dd05eec272ac4f4a896871798bab184137b574f51ff9b98b65eaf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 5000 bytes
font_01_sfnt_off0000fa14.bin
6ef654d6ec88ab8541b5be6fae6a696017373a35fd97c4bb204e51e79d5c180e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 11424 bytes