Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a815c36445c073…

MALICIOUS

PDF

73.2 KB Created: 2021-05-01 17:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: df552099739e8ceea02b1aa3c0d5f2ff SHA-1: c18fc28a42cc74574a16f7c66b3bd704cb9741ea SHA-256: e1a815c36445c073d615f7ba6d62e179053ad6fab751e038a6dbcecbd54f1499
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, indicating a potential link farm or phishing attempt. The presence of embedded URLs and the overall structure suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=les+miserables+castle+on+a+cloud PDF link annotation
    • https://cdn.sqhk.co/fowonawex/2A2hbid/dragon_hunter_2009_movie_trailer.pdfIn PDF document text
    • https://nexakolaligu.weebly.com/uploads/1/3/1/8/131871479/5647345.pdfIn PDF document text
    • https://cdn.sqhk.co/zijigemeworu/NBgc1sS/text_to_cnc_pro_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lufezeralon/Cjcxuha/legilile.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/jeiRgfi/mdundo_music_mp4_download_free_mp3.pdfIn PDF document text
    • https://wesuzekubiw.weebly.com/uploads/1/3/1/6/131607103/3520993.pdfIn PDF document text
    • https://dubevatuw.weebly.com/uploads/1/3/0/9/130969539/534dc.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/hphczlg/near_earth_asteroids_2019_video.pdfIn PDF document text
    • https://xadijonoru.weebly.com/uploads/1/3/3/9/133997446/752869.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/bm5ghjd/32214772412.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_068c2be5b95246cca57cc7ff5c82310e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/99180251479.pdfIn PDF document text
    • https://ff536187-e25a-4bd2-965b-ff1113cf40b0.filesusr.com/ugd/bfcccc_d5c31a50bbac4965bb3a3c16aa5634d1.pdf?index=trueIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_824d8d76f5bb44dea08988eeb8a94f4c.pdf?index=trueIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_4acf269d2aef4eccacd3bf19bb65518c.pdf?index=trueIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_3e9946b140b54ae8a43a7e0a4e605c6e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/simujix/craftsman_88173_parts.pdfIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_e2cb702aa05944e294c569c84bbd9e02.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/google_earth_3d_map_free.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_off0000e00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00D 5168 bytes
SHA-256: 420ef9abd2cafc3836a81abc0918814e8a369d3bb75ed477cf7e166ecd30fd04
font_01_sfnt_off0000f17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 11892 bytes
SHA-256: 2a66e6afd2553908183aa71ba44e295dd7543a8aab0cb64d3f5888e69b0f46bd