Malicious PDF — malware analysis report

Static analysis result for SHA-256 405f0556474257b5…

MALICIOUS

PDF

68.5 KB Created: 2021-03-24 17:55:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1ac959a20cb4da66ec7983ca5598d7f6 SHA-1: 87020212f75dc862b8bc514871c3ceadfe64490d SHA-256: 405f0556474257b5e4f804eb051f75c3c6eb7b65ac6be8ede0d40fb3362eb683
194 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics, suggesting it's designed to host numerous external links. The presence of a download button lure and the ClamAV detection as 'Pdf.Phishing.Trojan' further support a malicious intent. While no scripts were explicitly extracted, the document's structure and embedded URLs point towards a phishing campaign aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/strik?utm_term=math+practice+workbook+grade+3+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479933/normal_5fefbb6b95350.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/iWJmgcQ/superhero_tricky_bike_race.pdfIn PDF document text
    • https://malolikekex.weebly.com/uploads/1/3/4/7/134718462/54a3a1a2fe94373.pdfIn PDF document text
    • https://cdn.sqhk.co/vikojovowoso/NghhacT/weather_station_fortnite_battle_royale.pdfIn PDF document text
    • https://lopodudox.weebly.com/uploads/1/3/4/3/134339354/87a63b72.pdfIn PDF document text
    • https://cdn.sqhk.co/vomifavafo/dWicwjh/robbery_bob_mod_apk_hack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413735/normal_6042bb056835d.pdfIn PDF document text
    • https://cdn.sqhk.co/weruvewo/gjE23gG/gizenirudovabusube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481064/normal_5fd61975f273e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379733/normal_60113db179a8f.pdfIn PDF document text
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/861315.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/gjfjihk/37368649033.pdfIn PDF document text
    • https://tiletemilowa.weebly.com/uploads/1/3/2/7/132710791/rowuza.pdfIn PDF document text
    • https://cdn.sqhk.co/wugoselubiki/diejiFO/total_destruction_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486772/normal_60149f3d3a56e.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/Ozxphcv/cardboard_playhouse_michaels.pdfIn PDF document text
    • https://cdn.sqhk.co/xupebasolaw/priigeK/cup_of_jo_holiday_gift_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/ihlgggf/fox_sports_live_scores_rugby.pdfIn PDF document text
    • https://nujobivodiji.weebly.com/uploads/1/3/4/7/134771327/zamefavojipanixeber.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4e16d9da-0927-4957-8a4e-4544605d6055.filesusr.com/ugd/d7e550_c0a35a139a004f19a009cb10f980bc09.pdf?index=trueIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_319d714b56a84c3d9976ecca5aae2d84.pdf?index=trueIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_d81d004dad69447fb4b7c5f7fc7d058a.pdf?index=trueIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_535f6faddc69440190f907e9c27aa8c8.pdf?index=trueIn 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_off0000ce65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE65 5672 bytes
SHA-256: 4624d8ff654b8dd19d83da88ee5b80ac0c7d1eec0a613d1a1f6afbb95deab07c
font_01_sfnt_off0000e1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CE 10220 bytes
SHA-256: 5166e2842aa7a8320b809d4ba88f3b3d21a98304f7e20835bc09a2d517634694

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