Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f71aa47e00cd249…

MALICIOUS

PDF

74.0 KB Created: 2021-02-16 03:26:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c186cc2ba3f2035895f81f87a7e42821 SHA-1: e9b86cad9029b28cb154e6a2a9b5002712ca926f SHA-256: 7f71aa47e00cd249b4c1a63e3e8b65a434f08abd9327bdc43af10f25c1a2ec67
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, with multiple heuristics indicating it functions as a link farm. The embedded URLs and the PDF structure suggest an attempt to redirect users to potentially harmful websites, likely for phishing or malware distribution. No scripts were extracted, but the PDF's nature points towards a social engineering attack.

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://maypoin.ru/strik?utm_term=you+capitalize+school+subjects PDF link annotation
    • https://cdn.sqhk.co/pemanunid/47Ehcih/30466655088.pdfIn PDF document text
    • https://cdn.sqhk.co/gisepavuv/lDgcxQM/metal_slug_x_vs_2.pdfIn PDF document text
    • http://nutristrike-shop.ru/40740236043op22c.pdfIn PDF document text
    • https://cdn.sqhk.co/nalogigoke/jOuEjds/nudozivaperifixenele.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420903/normal_60230064a9b8b.pdfIn PDF document text
    • http://hookup157.site/jipitaxmwoi5.pdfIn PDF document text
    • http://vidclips.design/flocabulary_answer_key_6th_graderqjq8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426066/normal_5fd62fef1eedd.pdfIn PDF document text
    • http://proita.space/saint_seiya_awakening_shrine_guidemi5o3.pdfIn PDF document text
    • http://bitcoins-profits.com/rabbit_running_fast_around_room9igiy.pdfIn PDF document text
    • http://argo-tourism.com/636752362835qqug.pdfIn PDF document text
    • http://bezprovodov.guru/emulator_nds_versi_lama625vq.pdfIn PDF document text
    • http://lolkek.xyz/civ6_gathering_storm_tier_listy85w7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501042/normal_6008840f132c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE312 5152 bytes
SHA-256: 69538ab35fd84356f8badd392f340d2d849ed4f005191e3d3b35ca306ff0d6f2
font_01_sfnt_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 11500 bytes
SHA-256: 2fef374b36e605c0a8a7fb9c95e3f39f6732f7de97d87239c71fbf19e35e5fe5

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