Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0ea901bbf7f2c0…

MALICIOUS

PDF

75.2 KB Created: 2021-03-16 10:00:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: aacad620a71a2e67062208983da7d263 SHA-1: bc0822ec43c68f8bb49f008ed379e0c32605117d SHA-256: db0ea901bbf7f2c07f78fb0de836b1571228bd7fcaffd1d7b84863a067d74201
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with one prominent URL suggesting a lure for 'Instagram recovery tool reviews'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm hosted on disposable domains, reinforcing the phishing and malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/wix?keyword=instagram+recovery+tool+reviews PDF link annotation
    • http://albl.ru/miracle_ear_foundationiltke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403406/normal_6044d66c40abb.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/jihBmgg/woodturning_small_projects_videos_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/reromiwo/yjdijeC/26342010397.pdfIn PDF document text
    • https://cdn.sqhk.co/mifodirula/jhhlEiC/a_lone_star_heroes_love_story_series.pdfIn PDF document text
    • https://cdn.sqhk.co/wusirilunoko/duidLhc/11354550797.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/badovotupexokowefe.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/jibzyiw/idle_car_manager_cheat_engine.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486213/normal_5fe04260d4041.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/djgB9gF/48532825475.pdfIn PDF document text
    • http://pollsexpert.com/1420048746ad7eb.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/ia3wjfY/ccm_ice_hockey_skates_size_chart.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/afbd2fc7-12f3-4949-9731-31a353e07b35/52485681572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/445db43f-cd8b-4175-8536-9bf14ac562b7/yamaha_djx_2.pdfIn PDF document text
    • http://jamenajiko.myartsonline.com/ansys_thermal_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fab0d65-277d-4889-bcea-e39d383424a0/mabikufexave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5779ffe7-df55-44d5-86d5-40b39186fe4d/gofoloruludirirutusop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c8f0ef0-bf56-429e-8416-2cd4f1a6e45b/how_to_reduce_business_tax_philippines.pdfIn PDF document text
    • http://lewinozed.atwebpages.com/head_first_data_structures_and_algorithms_in_c.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_off0000e818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 5312 bytes
SHA-256: 60d5abadf83fecf5118051fb3f9339114189df2c485c9fa938d286c5f232aad1
font_01_sfnt_off0000fa2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2F 10896 bytes
SHA-256: 2a37907b5ee7c1700890f9e824b59d95d098490e76e57dde6e4d692c2cf56371

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