Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9519dcd97022861…

MALICIOUS

PDF

78.3 KB Created: 2021-04-06 20:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b59081da5d99fa9148f68e9d5f07f49e SHA-1: 3c66ef18976ab99be7693efa7a0243c683b8df88 SHA-256: a9519dcd9702286131985ad96cadd23ebcea6421d56311d3c4901662f18a4d73
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('botokaw.ru') that is likely used for malicious redirection. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's structure is designed to host many links on disposable hosting, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/strik?utm_term=safety+1st+car+seat+reviews+ratings PDF link annotation
    • http://duribil.iblogger.org/how_to_turn_off_doro_flip_phone.pdfIn PDF document text
    • http://lijobisegozij.iblogger.org/how_to_tell_if_lg_freezer_is_working.pdfIn PDF document text
    • http://fragcups.com/febarezogewokutigojoli2krvn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455881/normal_5ff106eca6aa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379230/normal_60497240e6b89.pdfIn PDF document text
    • http://7lessons.website/8175580910v096l.pdfIn PDF document text
    • http://zuxegesa.iblogger.org/fallout_new_vegas_cheat_codes_ammo.pdfIn PDF document text
    • http://totepopewag.iblogger.org/35118064455.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385213/normal_5fdfd64128786.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_600d0c7ef2436.pdfIn PDF document text
    • http://zoomita.fun/android_discussion_forum_app_abulletinoa6t0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479439/normal_6054eb61bb43c.pdfIn PDF document text
    • http://topmassage.net/bidixurulokumuxebit7qj18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485004/normal_5fc65db84355a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_6050134b90e22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420924/normal_5fcda092eb00c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427504/normal_604e76b74d9f2.pdfIn PDF document text
    • http://kostlike.site/how_does_the_herbalife_shaker_cup_workel09v.pdfIn PDF document text
    • http://sellforce.ru/8253563611b91ai.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f2b4921-0c8e-45c1-938f-0fcfa2708367/linotubonanogazuruj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d8c7786-33b6-445d-b0ac-39bcf215c4da/gelipoja.pdfIn PDF document text
    • http://gavuzolu.epizy.com/70811470309.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d4543d9-a59d-4a0b-be6c-930b42209bad/download_english_american_idioms_dictionary_apk.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_off0000f136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 5428 bytes
SHA-256: ab15ea75e6565045073367062edf4b88c6e5d6863efce19bc6d2838644dc8ab0
font_01_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 11444 bytes
SHA-256: eaba06eef4ff80a808784f3225d392a387eae7b50b536f226950992bc3e1d3f4

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