Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2dc323a0054b6e…

MALICIOUS

PDF

71.1 KB Created: 2021-04-29 01:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2145f6143f245d38d793812bdc14e426 SHA-1: 3d9463a6779c60ead2728c0f4845177f2388b2a3 SHA-256: df2dc323a0054b6e74d7643ce52b7e4c75f1cd3037318486c2c8645203a6a530
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting and link farm patterns, indicating a phishing or malware distribution attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and a link farm heuristic strongly suggests an attempt to redirect users to malicious sites.

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://nipisod.ru/strik?utm_term=lowrance+mark+4+ice+transducer PDF link annotation
    • http://sewukagazub.mypressonline.com/90878963218.pdfIn PDF document text
    • https://cdn.sqhk.co/revinoxu/hf2nif4/funny_riddles_with_answers_in_english_for_students.pdfIn PDF document text
    • https://cdn.sqhk.co/vedukosamo/5jeieja/77339890470.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480423/normal_6032a949dbad4.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/hjen5wc/nebelejukekixapunarabi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454051/normal_602b56953dd00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501364/normal_605815b2e287b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://punotonaduwize.atwebpages.com/dabixebuzonoloki.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/iti_departmental_exam_2017_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b976e78e-a6a0-4bca-b5cf-a56ab1b1cab2/where_to_buy_nordic_hot_tubs.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/characteristics_of_civilization_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a385eb6-78ef-4e5d-a898-c567eb91fec4/how_to_pair_sylvania_bluetooth_speaker_sb377w.pdfIn PDF document text
    • http://fipivolakiwupod.rf.gd/ritzer_contemporary_sociological_theory.pdfIn PDF document text
    • http://biwipekimati.rf.gd/lesivakuletejatagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da75ee67-3129-4483-b994-2b8ed59ff406/oxford_english_grammar_course_basic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ade735a-7d0c-44da-93b2-5712c737ada7/49732407844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b919ca-55fc-427c-9518-658c4b1bbd82/salary_of_software_engineer_in_amazon_us.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/real_analysis_by_bartle_4th_edition.pdfIn PDF document text
    • http://xabomiv.epizy.com/srimad_bhagavad_gita_in_oriya_download.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_off0000d74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 5236 bytes
SHA-256: 2d818efd0ac73c15ce97c1a5e67cf991ce1bb63a7a11ce49344bb09a666050bb
font_01_sfnt_off0000e921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE921 11152 bytes
SHA-256: 87deaa7446cfc0f56cebf8db6afc108968e3c13776275f0ee39ec9a4e0fbfa60

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