Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8315d9a532285b…

MALICIOUS

PDF

78.1 KB Created: 2021-06-01 09:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 7a31a2e6053946f636e5bf9f8239e87a SHA-1: 42f01208a8ff741c44e74ba769e662ad57f95549 SHA-256: 8b8315d9a532285b3c95c686dec86b38d3cf442342da825d4410e8b99ddc90ec
186 Risk Score

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a phishing or link-farming campaign. It contains numerous external links, many pointing to disposable hosting, and uses a deceptive title ('Confined space entry sheet') to lure victims. The presence of external URIs and a link farm suggests an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/123?utm_term=confined+space+entry+sheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457881/normal_6068ada7e1d0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470385/normal_5ff323887444c.pdfIn PDF document text
    • https://jijajaxasivezix.weebly.com/uploads/1/3/4/5/134588510/wanutemekejafamodevi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486374/normal_600899ae60090.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379217/normal_60053c74c1743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476939/normal_601705b4cfc4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450516/normal_5fe8ff7eaa782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475861/normal_6064c3342b806.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489586/normal_5fe14e677f6d9.pdfIn PDF document text
    • https://bawobejeburojax.weebly.com/uploads/1/3/1/1/131163695/josokapula_mavalibudopixit.pdfIn PDF document text
    • https://sawilemevopano.weebly.com/uploads/1/3/4/5/134577559/jiriz_zotil_rolalijafabivo_tisomemakago.pdfIn PDF document text
    • https://dakuxemi.weebly.com/uploads/1/3/4/8/134883968/felezebopagegu_wiviti_siwasozoneku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461746/normal_600f571ccd03a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490735/normal_604378803eb9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464302/normal_5fe8ea587ec4a.pdfIn PDF document text
    • https://jozurukezareta.weebly.com/uploads/1/3/4/7/134741488/767420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388405/normal_6019b475176e6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/24dffe9c-5842-46c8-a997-38885c54033a/hotel_del_luna_song_done_for_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62ce7875-cf25-44bb-a6d0-09ae2fffce52/kavepisepijapa.pdfIn PDF document text
    • http://wefolevemud.pbworks.com/f/jofuwibejiwufewet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c0cfb29-7746-4a0c-a1a5-62f3219c9b58/harlem_by_langston_hughes_analysis.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/pinemurogatogo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B1 5124 bytes
SHA-256: 76a60a9aa03f2d19c43425ccb1c60f1beaedd82ba2ce1100e0ab46933ccb2951
font_01_sfnt_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 10504 bytes
SHA-256: f2d7e96f8195665d676e33872efb333ebf35b6757081662947a868545df438d0
font_02_sfnt_off00011d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D04 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333