Malicious PDF — malware analysis report

Static analysis result for SHA-256 870279b163508443…

MALICIOUS

PDF

78.3 KB Created: 2021-03-13 15:34:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 98e1a51e2636ba882e067961155bc20a SHA-1: ed5eb2b69adc200330931b83d175f31a0e778ddc SHA-256: 870279b16350844341fa41fd4941b5de008402c33e36eea2be11af9cc6d2f749
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=why+wont+my+karcher+pressure+washer+work PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482617/normal_602c71b336a58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370078/normal_5fe18b9274672.pdfIn PDF document text
    • https://cdn.sqhk.co/kupuvikadob/aiekIdF/pbis_rewards_parent_letter.pdfIn PDF document text
    • https://cdn.sqhk.co/wexovezojab/jaSjbXE/dimogosexixofebakagoduxa.pdfIn PDF document text
    • http://zelolugo.22web.org/why_did_the_cow_hate_the_farmer.pdfIn PDF document text
    • http://dunetetemob.22web.org/chinese_movies_in_tamil_dubbed_full.pdfIn PDF document text
    • https://cdn.sqhk.co/mobixipotex/gefijjc/awesome_tanks_2_level_editor_cool_math.pdfIn PDF document text
    • http://purumobakeleju.22web.org/how_is_the_social_contract_theory_used_in_the_constitution_and_the_bill_of_rights.pdfIn PDF document text
    • https://cdn.sqhk.co/zewesifadeka/xhiLDgg/audi_q5_reliability_consumer_reports.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409254/normal_5fcbd4103323c.pdfIn PDF document text
    • https://cdn.sqhk.co/vonirosidejo/bg7eSBk/lowes_near_me.pdfIn PDF document text
    • http://ruwufuwetoj.mygamesonline.org/june_2020_calendar_printable.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gujugune.rf.gd/vebimaji.pdfIn PDF document text
    • http://zuvetimimu.rf.gd/calm_sound_effects_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f19a6c3d-bd81-4be5-b09a-b48733ad0299/washington_football_team_nfl_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/lozuba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c06c788d-e11c-4ea1-b09b-0c4c498cb099/reglas_de_acentuacion_de_las_palabras_esdrujulas_y_sobreesdrujulas.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/lulog.pdfIn PDF document text
    • http://wififeju.atwebpages.com/21205426584.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_off0000f424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF424 5412 bytes
SHA-256: 0c1ca4d5a3ee10388c3aa39a69e63cce840462cad270966eddae293e572078c3
font_01_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 11124 bytes
SHA-256: 4f173d9928e78b5fb0bd5b996332802a60ada660eaa4b4a19736246c6b84aaa0

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