Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af91e712a0e7422…

MALICIOUS

PDF

78.5 KB Created: 2021-05-16 19:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8690d16a4743f83069a18132307df9d3 SHA-1: bd91772826409a76f0afcf52f8ca5c9cd7e6d738 SHA-256: 0af91e712a0e74227f1a528be9c47e1e8e6e5df85089eaef17d97bddddc5f9f8
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external links, with one pointing to a suspicious domain ('gimoguvi.ru') that is likely part of a phishing or malware distribution scheme. The presence of urgency and callback lures further supports a phishing or scam attempt, aiming to trick the user into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gimoguvi.ru/strik?utm_term=how+to+clean+hp+deskjet+2630 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480162/normal_6026e6b49c74e.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxiwimemo/bjif1gf/weather_radar_map_live_app.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/dJLhcic/mtg_commander_collection_green_pre_order.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374373/normal_602ac577bb113.pdfIn PDF document text
    • http://nelawetazabuta.66ghz.com/ecommerce_store_business_plan_template.pdfIn PDF document text
    • http://homearfes.com/broadway_font_photoshopcibj1.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/FU9hbqe/73837604589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384831/normal_606e9f8eccb86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460981/normal_5ff690d50b843.pdfIn PDF document text
    • http://dirtygirl.fun/what_does_a_yellow_blinking_light_meany0sm6.pdfIn PDF document text
    • https://cdn.sqhk.co/birofinud/XC4XCTm/tolusafogepukezagefe.pdfIn PDF document text
    • http://xteenware.online/14_principles_of_toyota_production_system_ppth0qft.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483870/normal_602a21e1d004d.pdfIn PDF document text
    • http://7gusevshop.website/best_english_conversation_app_offline44f69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mezexefobotero.epizy.com/cambridge_igcse_ict_practical_workbook.pdfIn PDF document text
    • http://kasapesokegu.rf.gd/waiting_for_godot_text_download.pdfIn PDF document text
    • http://tipakofixu.epizy.com/juligemudepumamoxomu.pdfIn PDF document text
    • http://visititeralu.epizy.com/princess_diaries_google_docs.pdfIn PDF document text
    • http://zurinelu.epizy.com/dj_tapas_2018_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a1fcdac-a035-41ca-86d2-605b806d9c28/jisuvakotafid.pdfIn PDF document text
    • http://tukutuxobolekub.epizy.com/kafimanevenokosiw.pdfIn PDF document text
    • http://nolawasewunut.epizy.com/70905169961.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/763cfa76-347a-4e01-9a97-931e5af78727/52864079482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/137677cf-531e-4752-abdb-f8ef037cb976/go_go_elite_traveler_plus_troubleshooting.pdfIn PDF document text
    • http://gidigeja.rf.gd/ramizikogudifojugolofaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9c9b2c2-8383-4022-b517-98128daa4d1c/smart_goal_setting_template_for_students.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_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 5852 bytes
SHA-256: 6b663a587c5304d0030dcd33db5c4c5be8e26c44e3f3c1cceb4e1b465613a5bd
font_01_sfnt_off0001066f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066F 11196 bytes
SHA-256: da7b2efa48e51406657f8a4015a2b035ca6b0413a13e8cdf40a9a8afeadbe9a2

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