Malicious PDF — malware analysis report

Static analysis result for SHA-256 8833cae3238b62b8…

MALICIOUS

PDF

74.6 KB Created: 2021-02-27 19:52:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: cf8074eb56181f046c5e68f1172d43ec SHA-1: 3de3ae58857884475eeb4aa081b83a8d54c9f7b0 SHA-256: 8833cae3238b62b808716ec3fea85247abd623d17ea89b19870f938b229e5b36
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, with the primary malicious URL being 'https://pelibifir.ru/strik?utm_term=how+to+send+an+american+red+cross+message'. The document body, though heavily obfuscated, appears to be a lure related to sending messages, likely to redirect users to the malicious site. No scripts were extracted, but the presence of numerous external URIs suggests a phishing or redirection 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://pelibifir.ru/strik?utm_term=how+to+send+an+american+red+cross+message PDF link annotation
    • http://natur-bio.space/galadoviniccbvv.pdfIn PDF document text
    • http://uscreditinquiry.info/bezuligix43p9i.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/firex_hardwire_smoke_detector_with_9-volt_battery_backup_and_front_load_battery_door.pdfIn PDF document text
    • http://uplrezina.site/equal_rites_audiobook_nigel_planersuhp8.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/kikunojulejuj/93556207376.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/jenopunujukobomof.pdfIn PDF document text
    • http://betesemimototi.rf.gd/game_torque_burnout_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/bodesexiwemaro.pdfIn PDF document text
    • http://fadakivok.rf.gd/xaxanujofejafenu.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/sundara_kandam_reading_benefits_in_tamil.pdfIn PDF document text
    • http://leriwegozeko.epizy.com/ps2_emulator_for_android_4._21_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/solar_system_planets_information_for_kids.pdfIn PDF document text
    • http://weparaxopulo.atwebpages.com/how_to_find_the_mass_of_a_compound_in_a_mixture.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_off0000e874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE874 5280 bytes
SHA-256: ac0b53f88f967f10106fb6de875d4b316a0400303fe2cce5f638e32d5b4f7798
font_01_sfnt_off0000fa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 10240 bytes
SHA-256: 7b5e34d982a7a0b122f2a611a8f79ebb4a187163c733b70039881706ab5ab19a

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