Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02b9aaf2c886110…

MALICIOUS

PDF

81.3 KB Created: 2021-04-30 08:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5730921e23bb9349b63725c94b63cc0f SHA-1: 7eb5c2dbd0dfb0b57d71ae74251c0ff251114098 SHA-256: a02b9aaf2c8861108085265fb61dd93c4725cc6e654848290ad932db35ffd5d3
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to disposable hosting services and utilize UTM parameters, suggesting a link farm designed for SEO manipulation or phishing. The primary external URL, 'https://jottigo.ru/strik?utm_term=braun+thermoscan+7+ear+thermometer+for+adults', appears to be a lure for a product, likely intended to redirect users to a malicious site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://jottigo.ru/strik?utm_term=braun+thermoscan+7+ear+thermometer+for+adults PDF link annotation
    • https://zunezazawegor.weebly.com/uploads/1/3/4/6/134665047/nurukoxufidig_suzimedeb.pdfIn PDF document text
    • https://cdn.sqhk.co/tuforalogidu/ijeVies/the_rock_button_song_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408478/normal_5fcdad57bf590.pdfIn PDF document text
    • https://lolusegixasuvar.weebly.com/uploads/1/3/4/7/134770702/5dbdbf.pdfIn PDF document text
    • https://cdn.sqhk.co/sidigodoga/k20InTi/lojexuzosigexitekasineb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489979/normal_6058f598d2f18.pdfIn PDF document text
    • https://cdn.sqhk.co/fatidizeru/mjjJKgf/fazusatuxuwik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418013/normal_606dcfc893c6a.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/cS0qhbe/35062011907.pdfIn PDF document text
    • https://warubexe.weebly.com/uploads/1/3/4/6/134647576/c671b339a7e408.pdfIn PDF document text
    • https://cdn.sqhk.co/gasidonoda/vhfidid/esl_intermediate_reading_worksheets.pdfIn PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/8245668.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/ba04838a-2969-4b27-9d3b-47a257c84e3f/contract_aircraft_maintenance_engineer_jobs_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c595b9e3-931d-4f09-862f-2ba95ce00168/pukazuxodapoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a9fac8-c70e-4404-ae69-096957150aee/lopi_pioneer_pellet_stove_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fe239e3-80b3-4387-a372-78d79f206757/singer_sewhandy_model_20_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bed1071f-f229-4d11-b1bd-65f60b583580/35762213986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1c5609-4ed7-4000-b898-cfb89d4e3853/ashtalakshmi_stotram_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b848b487-5247-42ea-ae58-8218fdde20a9/91420057266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01891580-53a5-415d-9301-1cdb3294a9be/what_are_good_topics_for_aa_meetings.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_off0000ffb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB1 5392 bytes
SHA-256: 481654622ff0781975c87a85cbdd27164d97a4d12e202b4c502f0df4d681bd14
font_01_sfnt_off000111e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E1 10532 bytes
SHA-256: f1d23f3e1f527a0b9eefbf9c127a031d73224ab30e49613bd23cc8b1b4140d9d