Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f26d89aedeebf3…

MALICIOUS

PDF

91.3 KB Created: 2021-05-21 21:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 41fb3809dc614dd6e43d49dbb772561b SHA-1: 4bd0ec9e2bea6878699685838c688bd063c9f1f1 SHA-256: d1f26d89aedeebf37c501bb197eeeeed0e842a11416eb099360d59131f1870e2
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, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous external URLs, with one prominent URL being `https://dafemum.ru/strik?utm_term=skyrim+se+magic+animation+mod`. The presence of a link farm suggests an attempt to direct users to potentially malicious sites for phishing or malware distribution, aligning with the Spearphishing Attachment technique.

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://dafemum.ru/strik?utm_term=skyrim+se+magic+animation+mod PDF link annotation
    • https://kibanelamuvudu.weebly.com/uploads/1/3/0/9/130969844/b45d06a2685.pdfIn PDF document text
    • https://xilasofuvi.weebly.com/uploads/1/3/4/6/134651230/19fa48291fd6.pdfIn PDF document text
    • https://musonilemif.weebly.com/uploads/1/3/4/7/134752032/b6e3dab69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453914/normal_60564a3dddf59.pdfIn PDF document text
    • https://dabagurujor.weebly.com/uploads/1/3/4/3/134350609/9600299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415946/normal_6032e460b29b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484156/normal_5fd3dca363428.pdfIn PDF document text
    • https://dulowufokupi.weebly.com/uploads/1/3/4/4/134495444/genageninop.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/xidadexazipaxepoxu.pdfIn PDF document text
    • https://juvikawupuw.weebly.com/uploads/1/3/1/4/131409017/303dbfa6bf13210.pdfIn PDF document text
    • https://xarisoxetawekox.weebly.com/uploads/1/3/4/3/134399368/naguvofuwalapo.pdfIn PDF document text
    • https://wunogalabapa.weebly.com/uploads/1/3/4/6/134603674/3fd8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464297/normal_5fdd657b726df.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/d7ff4978-e1d8-4e3a-ae16-3a25bb5ba93a/48176020026.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/photo_video_editor_with_music_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d0de1a5-b026-46d0-b6a4-e54cdf6f931f/how_to_clean_venta_humidifier.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/lenizifegovaverenu.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/who_are_the_prime_ministers_of_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dddf848-09e9-471e-97dc-25a8ebb664da/zijenejiwubitopejowugoxij.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/vista_128fb_zone_programming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7259b56-ff60-4194-8463-fe735f2dc236/how_to_install_lame_enc.dll_audacity.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/botegenokotivetexegewovaw.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_off0001249f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249F 5496 bytes
SHA-256: a5983a43898281464741256c79063347bc81ba27833f8e3959a83cad3b60c00a
font_01_sfnt_off00013744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13744 11424 bytes
SHA-256: 249152342743e5c94c70c0a647904a520f434516f3913b8991891052cca2dfe8