Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d2497656ba15c3…

MALICIOUS

PDF

77.7 KB Created: 2021-03-11 23:57:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1cc603b0840dcbab22e42113a1d9ab2d SHA-1: e4a25c18dc92cb5f3727a0e23007c6732c91baf7 SHA-256: 28d2497656ba15c39c34371517b6c184429d488088ec47bd658b6e424b512231
146 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. The document body, though partially corrupted, suggests a lure related to game rules, which is inconsistent with the file's actual purpose. The presence of numerous external URIs, many hosted on disposable domains, indicates a phishing or malware distribution attempt. The primary malicious URL identified is https://ponafet.ru/strik.

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 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.
  • 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://ponafet.ru/strik?utm_term=what+are+the+rules+for+21+card+game PDF link annotation
    • https://cdn.sqhk.co/sigidezok/hbMihzi/basketball_court_background.pdfIn PDF document text
    • https://mujunoba.weebly.com/uploads/1/3/2/6/132682006/ketasopigav.pdfIn PDF document text
    • https://cdn.sqhk.co/karapenakozi/gxrs6Ag/free_business_plan_template_word_south_africa.pdfIn PDF document text
    • http://belkwigs.com/miluxogeperutebomimatae43zh.pdfIn PDF document text
    • https://forerijekakifur.weebly.com/uploads/1/3/5/4/135401119/zuxabo.pdfIn PDF document text
    • https://tuvozejuwubox.weebly.com/uploads/1/3/4/3/134323710/ee3b8d2dfe5.pdfIn PDF document text
    • https://lupenasax.weebly.com/uploads/1/3/4/7/134738003/pejuxa.pdfIn PDF document text
    • http://pifadopagel.scienceontheweb.net/dilanolakigikujawadoduba.pdfIn PDF document text
    • http://poverkavoda.website/63736856693fayhg.pdfIn PDF document text
    • http://bankrot-biznes.ru/wedding_invitation_templates_for_word_freevdn47.pdfIn PDF document text
    • http://ekzo-fruit.ru/verbos_irregulares_mas_usados_en_ingles_presente_pasado_y_participiob32e7.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/8b0ef957ecc1.pdfIn PDF document text
    • http://sokixatov.mywebcommunity.org/tadoxegodasopudal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fekife/4013089011.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/43667384434.pdfIn PDF document text
    • http://xufoziminep.onlinewebshop.net/scholastic_2nd_grade_workbook_printable.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_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 5632 bytes
SHA-256: edd8a8fd4650d8c6bed1c743d1e2d60d7ba8d59b5b78e11c7b275087e6ab3254
font_01_sfnt_off0001067b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 10452 bytes
SHA-256: 53eaa7892e87cd5d63016a307b6f93ebae8e6eb0c7c4a79e3fb63fce3488b0b4

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