Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54bb5620312d38d…

MALICIOUS

PDF

70.6 KB Created: 2021-02-13 16:46:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9edd734529fc9535797c1ebad25ac33a SHA-1: 36de40925c706dce16f3c157aed90dbf14965faa SHA-256: b54bb5620312d38d2a87462f127f99fb19c2b1837ccc15a78890985ba771d23e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with the primary one being 'https://bologen.ru/wix?keyword=arizona+driver%2527s+manual+book'. Heuristics indicate this PDF is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to facilitate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://bologen.ru/wix?keyword=arizona+driver%2527s+manual+book PDF link annotation
    • http://ruvagusowi.22web.org/free_music_to_android_tablet.pdfIn PDF document text
    • http://pixxel.life/kefadujasupugonapadabjvlv1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373776/normal_5ffe02cbabd3a.pdfIn PDF document text
    • http://bupatinewesep.66ghz.com/rovulizovoj.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/Ypidijh/sound_generator_for_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504839/normal_601e79a661e0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_60237fd51d72a.pdfIn PDF document text
    • http://sfhgfje5df.xyz/trim_a_home_christmas_tree_manuali2bi7.pdfIn PDF document text
    • http://skidki-day.site/chefman_air_fryer_user_manualkhfr4.pdfIn PDF document text
    • http://diposiz.iblogger.org/50405640935.pdfIn PDF document text
    • http://afracheat3.xyz/277592958184r2wc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380707/normal_5fe24e8243c2b.pdfIn PDF document text
    • http://ekzo-fruit.ru/ejercicios_de_ortografia_y_redacciontj9fb.pdfIn PDF document text
    • https://cdn.sqhk.co/womilepeba/hbTWidz/9715665649.pdfIn PDF document text
    • http://afracheat9.xyz/92947672358ipc5j.pdfIn PDF document text
    • http://orbitan.fun/lajafegisidotaxafepenaw3lnsv.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/jagux/snes_emulator_pc_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/captain_america_font_android.pdfIn PDF document text
    • http://zalufebali.rf.gd/17862603261.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/system_architecture_diagram_template_visio.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/92376682223.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_off0000d77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77F 5308 bytes
SHA-256: 2e18fc16951d2d6d10ef2ec57ea16d272e13db20254d1d92fb76293fe2387e73
font_01_sfnt_off0000e98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98B 10380 bytes
SHA-256: e0b62ccf62b253ad2d57b4bc21cdad7eca6e1e65cefc3f83fbf83fd05701420f

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