Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df7e61ab43538c3…

MALICIOUS

PDF

72.1 KB Created: 2021-05-20 08:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 15c2b01f695a58a689cb31398ccff553 SHA-1: 5ac14c3fe2009556c2878636c394601c7dcb73be SHA-256: 5df7e61ab43538c3f37504e17e8e964abf7ac6347505beabede52de64cbc7d52
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fokemale.ru/strik?utm_term=rick+ross+hold+me+back+remix+mp3+download PDF link annotation
    • https://lozojoni.weebly.com/uploads/1/3/4/3/134358657/2948042.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/d46efd9f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484115/normal_5fe386afab2e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_606b3c67cb393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449793/normal_6068cf9e8a912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405459/normal_60658e366399d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377642/normal_60502c3771867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416326/normal_604f42378f4a6.pdfIn PDF document text
    • https://jabiwogofuwax.weebly.com/uploads/1/3/5/3/135318236/cdec4a2764ccc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406216/normal_60326324bcfff.pdfIn PDF document text
    • https://misetibu.weebly.com/uploads/1/3/1/4/131438078/zijidufegerewu.pdfIn PDF document text
    • https://topulatemavi.weebly.com/uploads/1/3/4/3/134367493/voxajurewor.pdfIn PDF document text
    • https://sujanumijixedi.weebly.com/uploads/1/3/4/5/134501714/temerufodaweli-baviw.pdfIn PDF document text
    • https://ninefajesazaga.weebly.com/uploads/1/3/5/3/135384029/vokefiron.pdfIn PDF document text
    • https://xobijuveja.weebly.com/uploads/1/3/1/6/131606615/weduribefata-gejej.pdfIn PDF document text
    • https://lizodeva.weebly.com/uploads/1/3/5/3/135342900/6302255.pdfIn PDF document text
    • https://dinoromakutaxe.weebly.com/uploads/1/3/4/4/134479472/a59e0.pdfIn PDF document text
    • https://durunefa.weebly.com/uploads/1/3/4/7/134712847/laniranisiwe.pdfIn PDF document text
    • https://tuwavufubuxa.weebly.com/uploads/1/3/3/9/133997694/6ff6d2.pdfIn PDF document text
    • https://vuligezu.weebly.com/uploads/1/3/5/3/135391643/6b2a6cbcc.pdfIn PDF document text
    • https://xijapesulole.weebly.com/uploads/1/3/4/5/134588017/6586231.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e47e5fe-a32c-432e-9375-394feb4c062f/how_to_apply_filter_to_multiple_sheets_tableau.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c85e6e8-f3cb-4d5e-8594-a9f9853c447e/stream_a_river_runs_through_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b3b5e04-0000-4718-8476-1e5eff0423c0/dakol.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_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 5848 bytes
SHA-256: a3c3b3a9dd0286699b25559d1d7f58941e57b385eaed365372a24ba3d9b4f4d9
font_01_sfnt_off0000eaf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF1 12544 bytes
SHA-256: cc98b8d84bf093f4e11bdd55604690914de2a3810e90a4023d6d67c00626249e