Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca61c4e68602946…

MALICIOUS

PDF

77.5 KB Created: 2021-03-18 08:26:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 35877f8aa3bb2865e542251d4110e561 SHA-1: b561b78127159f86f620f3a80b4cceea93d1654c SHA-256: 8ca61c4e68602946d1ad8fc98bb5e87caee89e0586a0a5e18ca8fb988809f749
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting and utilize UTM parameters, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://mezovuduw.ru/strik?utm_term=why+maytag+ice+maker+not+working PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421937/normal_60390c9d9d3de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423442/normal_5fc614f3ebe2a.pdfIn PDF document text
    • https://cdn.sqhk.co/robimovule/jdjg8ig/97581820760.pdfIn PDF document text
    • https://cdn.sqhk.co/naruxibe/m4h0dEh/oxygen_bomb_calorimeter.pdfIn PDF document text
    • https://cdn.sqhk.co/razefudixid/dgigdij/robot_car_transformers_race_track.pdfIn PDF document text
    • https://cdn.sqhk.co/buwozumu/cicggdO/parallel_universe_4_hero_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427085/normal_5fcaa3e45c3de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416128/normal_601683e45e1e2.pdfIn PDF document text
    • http://jopkapopka.online/bimotumiwarorigobermkwl0.pdfIn PDF document text
    • http://kellys.space/how_to_use_dymo_letratag_2000g3ef8.pdfIn PDF document text
    • https://cdn.sqhk.co/potexunajo/Qjajchj/hitman_2_silent_assassin_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/AEkif6F/57876682658.pdfIn PDF document text
    • https://cdn.sqhk.co/satofapo/gghilif/jusirepinabof.pdfIn PDF document text
    • http://trendmobile.ru/guitar_music_theory_lessons_podcastihq0q.pdfIn PDF document text
    • https://cdn.sqhk.co/xizefonuma/heihiiq/alabama_teachers_credit_union_wire_routing_number.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369491/normal_5fceb076314d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://651f5d5e-5f42-4fb0-8380-889764ca350f.filesusr.com/ugd/b2f7c1_3f7eb9bf822348fab405e3efe707fc11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ec5b3a8-e985-44ba-8e92-038b0a44082e/taputufezujaxafuki.pdfIn PDF document text
    • https://1a899ca6-11bf-4464-971e-4bf0b885e765.filesusr.com/ugd/4ac3ff_86432e9ffedc4e2ebd2b09135896cdf7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7c15e5f-ecc0-4e6d-a9cc-905b3acdf31d/42648813173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/728ca70b-018d-4e5d-9793-d6d0531e2cd5/90300618102.pdfIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_0330741f6fb044838f0f46506d236acf.pdf?index=trueIn PDF document text
    • https://67536400-2f23-40e2-9d3a-36ae3f4dfb8c.filesusr.com/ugd/5312ea_bdf8d8509c89450b8f52cc76ebbd8ed9.pdf?index=trueIn PDF document text
    • https://a97be2a3-bfb5-42de-bba9-b145341b31aa.filesusr.com/ugd/1f2860_a899f4e1c67048a6b35a38d1b0868dcd.pdf?index=trueIn 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_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 5272 bytes
SHA-256: 26a814fae27d0f6f91251f20467704fb10fba65c2d6858d0d0f1b011a33a32c2
font_01_sfnt_off00010387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 10824 bytes
SHA-256: ca3c0d50bdffb15318562caaf0d51c2ffbaf391d30527d66d03f48ccbde046d3