Malicious PDF — malware analysis report

Static analysis result for SHA-256 733b82da18e43e28…

MALICIOUS

PDF

74.8 KB Created: 2021-05-26 19:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: df36d8fdfdf2aefb70c680753486bdf5 SHA-1: dd9e0603ee2b8e1f62ec3ed475b2325c79be01b4 SHA-256: 733b82da18e43e28cfbe0356bd9ab97df3b45a786267647c14a5fbfd9210e4c1
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded links, forming a link farm, with one prominent link directing to dafemum.ru. The ML classifier also strongly indicated maliciousness, and ClamAV detected it as a phishing trojan. The primary attack pattern observed is the use of embedded links to redirect users to potentially harmful sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/wb?keyword=craftsman%20lawn%20mower%20carb%20rebuild%20kit In PDF document text
    • https://static.s123-cdn-static.com/uploads/4488092/normal_5ff06209f0ccb.pdfIn PDF document text
    • https://nexolibevi.weebly.com/uploads/1/3/4/4/134463206/3481113.pdfIn PDF document text
    • https://senuwisaf.weebly.com/uploads/1/3/4/0/134018119/7425372.pdfIn PDF document text
    • https://zexivavu.weebly.com/uploads/1/3/4/8/134872555/bazorojoxuwuwil.pdfIn PDF document text
    • https://lababober.weebly.com/uploads/1/3/5/3/135329518/97de7447.pdfIn PDF document text
    • https://lukawonudos.weebly.com/uploads/1/3/5/3/135320707/8870217.pdfIn PDF document text
    • https://riwitasaroxaga.weebly.com/uploads/1/3/4/6/134656256/zojaw.pdfIn PDF document text
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/9d372eb914ca5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409614/normal_60344c2d5691a.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/49f1454c-f73d-43ba-bfae-bd69fff7b842/88920267225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/142b9a8d-530a-4ccf-a395-7257669cbb6d/nonob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db9fbb7c-01e7-4baa-9283-2f5737a3d021/808105146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5f70eea-1d94-4063-bdee-f87e223933df/79669955689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf3276f1-1ef4-4ec6-a5f4-21dd3b849b01/how_to_reset_smael_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6975c71-3aca-406d-b215-8609e86c259a/old_world_of_darkness_tv_tropes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ad84061-b401-4863-b2af-0914a54aabe8/john_deere_tractors_near_me_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba24b145-9093-41e9-bfad-81e10fc67aa8/25058114941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea41d120-f615-4f9b-8445-466ffb533e64/how_to_connect_behringer_xenyx_802_to_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbcd81f2-4b0c-45c0-b738-14046757a707/rimudasimozowafovarom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f3d4b81-72d4-4e50-96e6-1d1e5f6d7305/jemejitazamokokepumuvup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d2a8e26-2fbc-4963-b81a-c1e71826a046/59313586804.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_off0000e5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B0 5368 bytes
SHA-256: 29edfdf8db134ae02692da24cf9da894f02e33f92f3408a2f2696786a6214be3
font_01_sfnt_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 11104 bytes
SHA-256: 7dfdbea1d465d80f4b0eeba2157c18ba278fef46ebd62b28a3f3f0dc3d296737

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