Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcca9490cdf33b78…

MALICIOUS

PDF

69.7 KB Created: 2021-06-01 10:39:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0abadc21f09daf55fa0e2cc2b807e5e1 SHA-1: b02dd90dd11f42efd86c1fe33c592386adb18b60 SHA-256: fcca9490cdf33b78ba0fced63860d2e27c81663cd6806e5c112975eab4185dd0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs, many pointing to disposable domains and acting as a link farm, which is characteristic of phishing campaigns designed to redirect users to malicious sites. The document body was unreadable, but the presence of numerous external links strongly suggests a phishing or credential harvesting attempt.

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://cructi.ru/pbw?utm_term=d%2526d+3.5+player%2527s+handbook+2+feats PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446930/normal_601178304e6d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377697/normal_6052477294382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453329/normal_60445f0cde16f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482638/normal_60443ea195730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382639/normal_604d04968a0c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387929/normal_5ff712a7e95ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144420429/zekuwosonawusevagix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c15e579-f545-461d-ab81-d927d44c8060/2006_bmw_330xi_engine_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c30f76f8-5df9-42ad-914e-23678caa4085/how_to_pair_beats_solo_wireless_to_mac.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/beethoven_spring_sonata_violin_sheet_music.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144449886/gta_5_mobile_apk_data_mod.pdfIn PDF document text
    • http://siruzosu.pbworks.com/f/ultimate_back_fitness_and_performance_free.pdfIn PDF document text
    • http://zelovoguvunu.pbworks.com/f/penibibi.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144422331/can_a_washing_machine_timer_be_repaired.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/752aacfa-d61e-4604-97db-886dc938b5ec/labemimapemove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2486acd-8890-4b34-a27c-c22e9cf0412c/85645707281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceec9ea0-6060-4bbc-89cf-04a60fb8473d/how_many_different_atoms_are_there_in_a_compound_brainly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/160184da-0641-47bc-801f-3914617b975a/hiring_requisition_form_template.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_off0000d663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD663 4156 bytes
SHA-256: 5bcf7f318894cd8667f709bf970fa8c582a8027402ea75fdf14ac0e15260a4d2
font_01_sfnt_off0000e491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE491 11588 bytes
SHA-256: af7c74fc9794c7abd783996fc6b82d29814e803b835fd8e53b6d2d0b4380a09f

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