Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec04fcf3614d0da2…

MALICIOUS

PDF

78.1 KB Created: 2021-04-01 17:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0929ec820e1e23fe0fdcb67e864f4f02 SHA-1: a1ab19eca65200a86fccaa4a1eee205448a56b89 SHA-256: ec04fcf3614d0da2ffb7d569cfc87c4e0c814e8c335c29321b3375432e284a8e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains numerous embedded URIs, with one pointing to a link farm on disposable hosting, suggesting a tactic to manipulate search engine results or distribute malware. The document body is heavily obfuscated, but the presence of external URIs and the heuristic firings indicate a malicious intent to redirect users to potentially harmful content.

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://nipisod.ru/wix?keyword=untitled+poems+by+tupac+figurative+language PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369313/normal_601cb78906f60.pdfIn PDF document text
    • https://cdn.sqhk.co/mibaforetu/ibheggV/mitewuzijusukoluxidurubi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477181/normal_60401a19eeb45.pdfIn PDF document text
    • https://cdn.sqhk.co/tigadikem/ggigHtd/tencel_bed_sheets_for_sale.pdfIn PDF document text
    • http://xabidakidu.iblogger.org/50012696658.pdfIn PDF document text
    • https://cdn.sqhk.co/winogolelog/zigwian/nora_fatehi_new_songs_download.pdfIn PDF document text
    • http://bazujubu.iblogger.org/angle_addition_postulate_quiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472764/normal_604e0499eaea2.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/jfGhgAs/paxubepukanemesuzuk.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/xeponodij/wisodovuf.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/commodore_64_computer_compendium.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5c75ec7-824c-42f7-9ca8-5b06d8fe2b69/14985121246.pdfIn PDF document text
    • http://zesobulujefur.rf.gd/sulufamovavifosivirov.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/pediatric_hypertension_guidelines_aap_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb590837-5b64-41f7-ba1a-5964ceea6e2b/banow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44c11994-01a1-479d-982b-cc2a19a61491/how_to_tone_body_and_lose_belly_fat.pdfIn PDF document text
    • http://zilaxeputeso.epizy.com/jefifepesun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12010b18-fc7c-4e29-926c-c0d94cf514ba/delta_carry_on_luggage_size_and_weight_restrictions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d8d746d-b74f-4596-a7fb-8d8b77a6c17f/64425719812.pdfIn PDF document text
    • http://naburonip.myartsonline.com/allyn_and_bacon_guide_to_writing_fiu.pdfIn PDF document text
    • http://zaxukesaludu.epizy.com/08_avenger_battery_location.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_off0000f379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 5768 bytes
SHA-256: ea07fde6ad55a0b399f01cdaa27f08d25dbd36ce9265ce7cec139e434c3635f2
font_01_sfnt_off00010715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 10560 bytes
SHA-256: 9418e66fe0aba54f964a99e74186fe706d57350c1fa12eca51c0ee5867cd5694

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