Malicious PDF — malware analysis report

Static analysis result for SHA-256 869a66cbc7bebcb6…

MALICIOUS

PDF

76.9 KB Created: 2021-03-11 18:30:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 484cd72d1c13b4583f1a3bc9ca945285 SHA-1: dcdd62a2ba4ceb3e85715f3364c4c84c1a1c8b88 SHA-256: 869a66cbc7bebcb6588342d3b193249dc55ab409e8d880e39acd4c35277c592e
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, including detections for malicious redirector links and link farms. The embedded URLs, such as 'https://dafemum.ru/123?utm_term=bootstrap+modal+login+form+validation+example' and numerous others pointing to disposable domains, suggest a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to wkhtmltopdf and Qt, indicating it was likely generated by a tool rather than being a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=bootstrap+modal+login+form+validation+example In PDF document text
    • http://mozobadijoba.medianewsonline.com/48008762363.pdfIn PDF document text
    • http://momsmall.space/bridget_jones_diary_full_movie_480pusi1q.pdfIn PDF document text
    • http://electrumwallet.buzz/chapter_11_introduction_to_genetics_vocabulary_review_answer_key3dd84.pdfIn PDF document text
    • http://1gusevshop.space/nugekidexotolozi3ajwl.pdfIn PDF document text
    • http://timelessdecorum.com/delonghi_aircon_fault_codesmfedc.pdfIn PDF document text
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/ditexema.pdfIn PDF document text
    • http://yildirimotobursa.com/40244872279uqsqm.pdfIn PDF document text
    • https://mezepimera.weebly.com/uploads/1/3/4/8/134860759/8163868.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/wusobotikimevatalapum.pdfIn PDF document text
    • http://onsideball.info/hack_wifi_online_on_androidf2o4d.pdfIn PDF document text
    • http://zitirisiz.mywebcommunity.org/little_shop_of_horrors_musical_cd.pdfIn PDF document text
    • http://antileqphh.site/terry_pratchett_hogfather663z3.pdfIn PDF document text
    • http://lovelid.xyz/ti_poweramp_full_version_unlocker_cracknnrqf.pdfIn PDF document text
    • https://vexuneka.weebly.com/uploads/1/3/4/5/134584550/9318133.pdfIn PDF document text
    • http://nanolenka.xyz/what_are_government_jobs_for_mechanical_engineerswbn2w.pdfIn PDF document text
    • http://bathforlegs.xyz/bells_of_notre_dame_sheet_music_clarinetvhamv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_a8d00797493a4bfb8da2177122a3c39b.pdf?index=trueIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_49e882a3b72e48d8bcc7e69fd8352c52.pdf?index=trueIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_89af97f938ce4282a517691ee8dac9b9.pdf?index=trueIn PDF document text
    • http://nekelaxowe.atwebpages.com/ternyata_akhirat_tidak_kekal.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_off0000e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 5536 bytes
SHA-256: a1d83cea5ebaccd7caa295d01902ed21e4628ff881f9ef1dc8fc120732af18fe
font_01_sfnt_off0000fc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 12976 bytes
SHA-256: a35f0a769390194a743e0f0b401fade082838224eb8e2817a7158e71bcf7e833