Malicious PDF — malware analysis report

Static analysis result for SHA-256 9278221ecd028fbe…

MALICIOUS

PDF

77.7 KB Created: 2021-02-17 18:41:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f060a63932ebc5cf106ca18d717ab31f SHA-1: adf3de3b07362d7fb8ffd35cab4b7858f19e2994 SHA-256: 9278221ecd028fbe5f8cc43e2f7c7be667abb57f72c745b3d57fff11dd3f3aff
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document, potentially used as a lure or to redirect users to exploit kits or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://leonvi.ru/strik?utm_term=poesia+mexico+creo+en+ti+letra+completa PDF link annotation
    • https://cdn.sqhk.co/vuzefegevo/id8Tr3a/online_multiplayer_games_with_friends_pc.pdfIn PDF document text
    • https://fejavuwuvumago.weebly.com/uploads/1/3/0/8/130874007/5035346.pdfIn PDF document text
    • http://naturfresh.fun/adding_and_subtracting_algebraic_expressions_worksheetshzibh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369908/normal_5fd83fb58b36b.pdfIn PDF document text
    • http://xitaboketeloba.iblogger.org/87051163702.pdfIn PDF document text
    • http://reduslim-shop.website/99910853269spiwf.pdfIn PDF document text
    • http://edevletorg.com/britten-norman_islander_maintenance_manual_download69hp5.pdfIn PDF document text
    • https://jebomifodav.weebly.com/uploads/1/3/0/8/130874614/jagemirawowibod.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxovowupofa/jjidjdO/only_one_of_kpop_group_savanna.pdfIn PDF document text
    • https://fukuperuka.weebly.com/uploads/1/3/4/8/134883813/1649240.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5fcb5e0a3bad0.pdfIn PDF document text
    • https://cdn.sqhk.co/nananava/igd7LMP/85186166023.pdfIn PDF document text
    • https://cdn.sqhk.co/difanemifal/Hhggjhj/crazy_car_impossible_track_racing_simulator_apk_download.pdfIn PDF document text
    • https://lerelapukuvi.weebly.com/uploads/1/3/0/7/130740054/7994320.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE374 4936 bytes
SHA-256: 10b26c0c08af29428717d001df13c95bbd3c531e0c99dc85882f497f6f9995f3
font_01_sfnt_off0000f41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41D 11504 bytes
SHA-256: ed7f7f457911b429639763311f85ca1c4beb352ab0ff13fa5c44ae987e99a5e2
font_02_sfnt_off000119cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CC 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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