Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4948ac1eee14c3…

MALICIOUS

PDF

75.0 KB Created: 2021-01-18 23:44:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 0371b71698b9cc66dbb68ef37e912f4b SHA-1: 7c8841a53ce73203fdddaa35808c16836575402f SHA-256: cb4948ac1eee14c39c3b8b7cfe30db90b053e9ae84a868242b8272ffc06e7f2e
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. The document body, though truncated, suggests a lure related to a 'tabletop pac man arcade game for sale'.

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://leonvi.ru/wb?keyword=tabletop%20pac%20man%20arcade%20game%20for%20sale PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369907/normal_5fc775555cb02.pdfIn PDF document text
    • https://kajumosezu.weebly.com/uploads/1/3/4/7/134749214/nanaxali.pdfIn PDF document text
    • https://site-1177174.mozfiles.com/files/1177174/your_guilty_conscience_quotes.pdfIn PDF document text
    • http://vosalax.22web.org/online_application_form_du_2018.pdfIn PDF document text
    • http://nuzabokazovuwa.iblogger.org/speaker_booster_pro.pdfIn PDF document text
    • https://site-1168114.mozfiles.com/files/1168114/android_store_data_in_sqlite.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421207/normal_5f97076f8d54f.pdfIn PDF document text
    • https://gikositaga.weebly.com/uploads/1/3/4/7/134773380/6925998.pdfIn PDF document text
    • https://site-1174146.mozfiles.com/files/1174146/az_screen_recorder_v_2__5_apk.pdfIn PDF document text
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/zifug_gixotosemis_digade_ramazojumovo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/firudegix/capitalism_lab_full.pdfIn PDF document text
    • http://negavutagogo.epizy.com/netflix_apk_hack_hd.pdfIn PDF document text
    • http://zekubegem.epizy.com/comorbidity_and_guidelines_conflicting_interests.pdfIn PDF document text
    • http://metukobitoro.rf.gd/video_editor_app_for_android_apk.pdfIn PDF document text
    • http://suzurexitumafod.epizy.com/barbie_dress_up_games_app.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/letters_and_sounds_gov.pdfIn PDF document text
    • http://relimimukavewuj.rf.gd/mensa_iq_test_answers_2018.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 5304 bytes
SHA-256: 1f52c95efca2eaeed16319a9cd37eec0f3ceabb696e102c76ae583fe7dc1a80d
font_01_sfnt_off0000ed50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 10288 bytes
SHA-256: 44619cbde7510ecaf43459f03afea4827be846c7d5b2a2817afb90f98e1f23d6
font_02_sfnt_off0001106c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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