Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1992d463694f4f8…

MALICIOUS

PDF

87.5 KB Created: 2021-03-29 07:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3fd7757849c4e7ae70517156d1b669fd SHA-1: 078512dca113eec96696c2c9d1824f88639dc3aa SHA-256: e1992d463694f4f8d92dc2ee67ce1f081b08cf9f1b505108651b29f3bdb9f1da
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, and is identified as a phishing/malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links likely lead to further stages of attack, such as credential harvesting or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/strik?utm_term=distressed+debt+analysis+by+stephen+g.+moyer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422620/normal_6058db8d4701f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393026/normal_60068ed016a3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479674/normal_5fe0cd46972fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375356/normal_60245f7beb4ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446036/normal_6013bf141c791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454678/normal_601e035a5411d.pdfIn PDF document text
    • https://regogugone.weebly.com/uploads/1/3/4/8/134891767/wefujuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419192/normal_605ee5dbe87de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470232/normal_602ae33311cca.pdfIn PDF document text
    • http://nukels.xyz/mary_j_blige_albums_downloadolqxx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470830/normal_5ffa6e89269d1.pdfIn PDF document text
    • https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/tiwoxudesutasavumo.pdfIn PDF document text
    • https://toxutumopomepe.weebly.com/uploads/1/3/5/3/135327812/konowazelenezemameno.pdfIn PDF document text
    • http://wordsidepost.top/how_to_do_multiple_selection_in_excel_drop-down_list8t5h4.pdfIn PDF document text
    • http://bizbize-yeteriz.org/4126139516cydjj.pdfIn PDF document text
    • https://buvelixajotoneb.weebly.com/uploads/1/3/5/9/135982000/nixalek-lokamotaxebad-kefosolamogi.pdfIn PDF document text
    • https://totamozosapopa.weebly.com/uploads/1/3/4/7/134712517/xumidezupin.pdfIn PDF document text
    • https://wuzovogupo.weebly.com/uploads/1/3/4/7/134720757/a7de1a885.pdfIn PDF document text
    • http://naturfresh.fun/reduvabizokisu6ndx7.pdfIn PDF document text
    • https://fozuduwepekata.weebly.com/uploads/1/3/5/3/135320000/welamumasolapefulog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_719eb320fa2f4f9cb13f130b6b1846c9.pdf?index=trueIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_bd288bc383a6415cb9b900ef7224eb2f.pdf?index=trueIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_2d2c91a383014981abd318b49a2651b7.pdf?index=trueIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_dc344d2d1e464ce584cacb0d44543d63.pdf?index=trueIn 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_off0001152e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152E 5648 bytes
SHA-256: 11f20e8b607f26d9089fe3d8ce8e821c51ffced377085122863b536ef35e80db
font_01_sfnt_off0001283d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283D 11824 bytes
SHA-256: bae240c2bb8eeffc2c0f8639893061002b49ecc872efabfa982acfa0767e0426