Malicious PDF — malware analysis report

Static analysis result for SHA-256 165499145e4371d7…

MALICIOUS

PDF

79.9 KB Created: 2021-05-07 20:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 8f9a91c642b41d65171160a37eca1ca5 SHA-1: 4641560488a4c5deccebbc5db65e106b8cb36b7e SHA-256: 165499145e4371d78891d76600a6b4bdc6225cb222c1908ac5fc243886361b6d
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URIs, with at least one pointing to a suspicious domain ('pelibifir.ru') and another identified as a link farm on disposable hosting. The presence of these links suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or malware 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://pelibifir.ru/strik?utm_term=dream+interpretation+dead+mother+smiling PDF link annotation
    • http://itawegan.fun/nolawerufix4dw7.pdfIn PDF document text
    • http://bonusiotsbera.online/larawozefurerohy2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486354/normal_60353f8d0cbb6.pdfIn PDF document text
    • http://idealslimitalia-official.site/55893730239q8nth.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_5feaf019e5e8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480736/normal_603ee1bdea079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405899/normal_60187c387ee5a.pdfIn PDF document text
    • http://clyb-wylcan3.space/14849314840s32jr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369775/normal_606dfd05102c4.pdfIn PDF document text
    • http://tryporte.xyz/tawiwotukobopujisoxhp1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://warodisomadux.epizy.com/similar_triangles_worksheet_8th_grade.pdfIn PDF document text
    • http://dekefolujif.epizy.com/hp_deskjet_ink_advantage_2545_all-in-one_printer_cartridge.pdfIn PDF document text
    • http://sidiwen.epizy.com/3m_electrical_tape.pdfIn PDF document text
    • http://bapexuzajo.epizy.com/performance_fee_vs_carried_interest.pdfIn PDF document text
    • http://nalujisutu.epizy.com/refemiduturol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e68fde-6db4-4bdc-81e1-b4e022f0f19a/who_is_the_poorest_member_of_bts.pdfIn PDF document text
    • http://pekufupudemolor.epizy.com/suffix_worksheets_for_grade_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aca519d4-0ce5-4d59-b4c8-ce7fa933289d/dell_vostro_1500_price_in_india.pdfIn PDF document text
    • http://zuvemodu.rf.gd/predation-starvation_trade_off.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_off0000fdce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCE 5372 bytes
SHA-256: 499e07632e6aeed75282aaef0ed5b084df779723efdbff132f5dd9c2d6f735e1
font_01_sfnt_off00010fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE7 10132 bytes
SHA-256: f0920088f6df93ebae34737b74817e9a2dcfa131d7126aab26b896c27baae946

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