Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafec9a21d45825f…

MALICIOUS

PDF

89.5 KB Created: 2021-04-29 01:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93de8a337c6c202535170f97ff06f592 SHA-1: 792b71133fa183cd08c476e02bba7b0f74d3e2bd SHA-256: bafec9a21d45825f1fe12b24d1240575082c51cc85ce329a3a8c32ae4fad11f2
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external URLs, many of which point to disposable domains and are part of a link farm, a common tactic for phishing or distributing further malware. The document body, though heavily obfuscated, contains references to wkhtmltopdf and Qt, suggesting it was generated by a tool rather than being a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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=the+magus+explained
    • http://coolvdomaion.online/99322615567xckxm.pdf
    • http://gixodugesu.medianewsonline.com/pengertian_accidental_sampling.pdf
    • http://mosebuzixat.mywebcommunity.org/download_bhagavad_gita_in_tamil_in_format_for_free.pdf
    • http://gejudoxe.mypressonline.com/rehabilitacja_po_alloplastyce_stawu_biodrowego.pdf
    • http://lnstagramverificationbadge.com/how_to_use_the_single_cup_keurigofaq2.pdf
    • http://xedijama.getenjoyment.net/87168155293.pdf
    • http://kungfumalibu.com/material_lead_time_report_in_sapmv6df.pdf
    • http://byseles.xyz/latebefupugovuauts.pdf
    • http://goxivomibivufuv.mywebcommunity.org/tijuzituxu.pdf
    • http://gukabibus.mygamesonline.org/is_english_composition_2_hard.pdf
    • http://teplotronic.ru/wiguniriwisrtkc.pdf
    • http://xizugef.medianewsonline.com/verij.pdf
    • http://badoxik.scienceontheweb.net/jewujajefuvizujijaxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lumalidik.atwebpages.com/construction_emergency_action_plan.pdf
    • https://uploads.strikinglycdn.com/files/cb159bbe-0f42-4f2e-8cd2-8c4ae63f59bd/does_epic_emr_work_on_mac.pdf
    • http://kigokigaruv.myartsonline.com/77598900823.pdf
    • https://s3.amazonaws.com/gosete/tixunukesebixasuzugixik.pdf
    • https://s3.amazonaws.com/tomaxade/ramopoparazamekobodivin.pdf
    • https://uploads.strikinglycdn.com/files/85997d7c-9402-47ee-8825-57ffe01ed967/yamaha_dgx_500_music_rest.pdf
    • https://s3.amazonaws.com/xipavir/car_fault_finding_guide.pdf
    • https://s3.amazonaws.com/jenagubadopi/dagus.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012178.bin
070b2e03d01dee6c74caf2e6749c5bf86f6b446c8facff754207daea776fecc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12178 5292 bytes
font_01_sfnt_off0001335b.bin
10b63e1a0261409b4e30e82b635b610f8e09c002393934450b98023aaf496911		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1335B 11108 bytes

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