Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be9d943409d9d8c…

MALICIOUS

PDF

80.7 KB Created: 2021-05-28 05:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7a5dd1f68c3a4d2597e2bbf5edf136cd SHA-1: 891f34a89c53ef5b3ed395268907a3f0464252fc SHA-256: 8be9d943409d9d8c792be9572bee5153c09dad663ca7df3f1582a6c8d3872d78
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://dugedepap.ru/strik?utm_term=how+to+improve+sound+quality+on+iphone+11', indicates a lure to a potentially malicious site disguised as a search result. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://dugedepap.ru/strik?utm_term=how+to+improve+sound+quality+on+iphone+11 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460247/normal_6067a2ec3963c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368964/normal_5fdda1b683336.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446394/normal_601ba6b78df67.pdfIn PDF document text
    • https://gozenanojive.weebly.com/uploads/1/3/4/7/134747079/4157866.pdfIn PDF document text
    • https://jobugatiponez.weebly.com/uploads/1/3/4/2/134234820/nitexawemizoje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426263/normal_60285785eb8b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376375/normal_603fd8c0c8114.pdfIn PDF document text
    • https://tovakuroxi.weebly.com/uploads/1/3/1/1/131164121/jinov-bajegonuvanimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476757/normal_60215006b43ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374953/normal_5fcbe332918da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473618/normal_5ff6065381a44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370055/normal_5fe5afa8d90a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445754/normal_5fdc4fec32f1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453142/normal_604ed56c2e15b.pdfIn PDF document text
    • https://vinunawamezod.weebly.com/uploads/1/3/1/3/131380031/1987925.pdfIn PDF document text
    • https://malabukepi.weebly.com/uploads/1/3/0/9/130969546/4766539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499309/normal_600cab3e1669c.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/3026b43a-ff87-4db6-b161-f73f49a5e305/singer_futura_ce-150_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0356dcd8-a353-4107-8970-0615f20f1f70/what_time_does_burger_king_open_for_breakfast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13c568ed-e631-4569-aeda-ae954eaf0e9b/how_to_make_my_own_holy_oil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d576956e-94f3-4c92-8dbf-765fa063eb18/24034369509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34f38e7f-8d33-42ea-bcb1-2a27b7ee2fe5/bash_scripting_basic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb928986-7152-4815-9946-77c64b368e4a/american_dad_episode_scripts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b5aaf89-df8f-4fc3-a08c-ff12e1e639f3/buy_bowflex_treadmill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ef78bfc-425c-4767-8d2d-fda3f6761ed8/8106717094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcecaa20-fc34-4e0f-8325-55c0319c99b3/rijevewotivapexab.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_off0000fc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 5592 bytes
SHA-256: 679a1fd0bff13e9ce898dc4807fc6fd052d78e22b1e3162414b888e46df5efca
font_01_sfnt_off00010f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F13 10980 bytes
SHA-256: 3410fb1bdb5c07cd557c7e19733cf6027abb068cdd9c790cde56a3b0d10f7527

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