Malicious PDF — malware analysis report

Static analysis result for SHA-256 905a2c22dae3d590…

MALICIOUS

PDF

73.4 KB Created: 2021-02-28 03:24:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2798fb1fa9eeb9bf599638a903d3afd6 SHA-1: 883e3a6ec210b975fd88ccbd0fd7c2fbeb050c51 SHA-256: 905a2c22dae3d59002e645de4d24508a05d3c6f6112ab1178676154d6189a8c1
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm designed to redirect users to malicious sites. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

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/wb?keyword=big%20little%20lies%20theme%20song%20chords PDF link annotation
    • http://pubgucbayim.com/daily_maintenance_schedule_templateyuqd5.pdfIn PDF document text
    • http://handler-autoscout24.com/konibosevovozonubot07kb.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/short_story_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/fKZVGfr/67325022576.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/97392418847.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/2iihgif/senatiduzir.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/ih5CghG/fall_menu_ideas.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/us_army_pistol_qualification_target.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/42681165130.pdfIn PDF document text
    • http://spencermcman.us/what_size_are_shark_vacuum_attachments7xo4q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kewevagisugimuw.onlinewebshop.net/vicks_starry_night_humidifier_use_without_filter.pdfIn PDF document text
    • http://tifavamifikas.myartsonline.com/zuxuvujegajosabawelan.pdfIn PDF document text
    • http://weparaxopulo.atwebpages.com/how_much_is_covid_test_in_california.pdfIn PDF document text
    • http://bugenerefajujus.atwebpages.com/16054228350.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_off0000e3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 5192 bytes
SHA-256: 0d6fbe1265f81c2ca57f1d7cd9acdc1d07fa202d6f057b26c7921edad36e8654
font_01_sfnt_off0000f559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 10408 bytes
SHA-256: c395d2ee5af6b817deacf58a43a4adc487873c0cecd66919f375f36df3df358b

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