Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c34ed117e2855c…

MALICIOUS

PDF

95.1 KB Created: 2021-03-01 18:26:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ab23617fb0421699b25f8f5db4127bf1 SHA-1: 1914ac162ee6ad7e8a89c7bc7de11a8bb3fc32d7 SHA-256: 34c34ed117e2855c91e147458fb201c736299de3d61ef7771c89d11b98ffba8e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://crophysi.ru/strik?utm_term=overlord+light+novel+anime+end PDF link annotation
    • http://dorightunion.com/rotipozujemonoveribfvqd5.pdfIn PDF document text
    • http://fherixq.com/tikonedovukizaresaxodinodx22y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418987/normal_60338ae56ccc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379379/normal_601f5a935b934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420766/normal_6019b3a153fd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454163/normal_600d3fb1aea55.pdfIn PDF document text
    • http://niburufajanuto.sportsontheweb.net/cirque_du_freak_book_series_reading_level.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/how_to_use_ninja_kitchen_system_1200.pdfIn PDF document text
    • https://faperusa.weebly.com/uploads/1/3/1/4/131454178/kagabin.pdfIn PDF document text
    • http://vnds-v.website/xavobujepuvoj7bto.pdfIn PDF document text
    • http://geniusenglish.space/sql_server_management_studio_17_format_sqlxci9j.pdfIn PDF document text
    • http://triple-doska5.club/2224542383994es3.pdfIn PDF document text
    • https://revasarubon.weebly.com/uploads/1/3/5/2/135295272/453a7088.pdfIn PDF document text
    • http://cmb-eco.com/59109789323b42pz.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/padadutiseni/nadalamotegikodinanatupej.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/benawexuduxuraxewuxubej.pdfIn PDF document text
    • http://redifigikutusoj.myartsonline.com/is_pokemon_red_and_firered_the_same.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/ligifimawizumivixujeronid.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/pidafuwuraw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D62 11772 bytes
SHA-256: f6af3d8c01d35d05927ef83a4c4f3669bfd8f51b0a833de913e6c0cf9f8e8015
font_01_sfnt_off000133da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DA 5148 bytes
SHA-256: b3c29fafcb5a1ed5712964eef2466996a292f6514b21c45ae34457f8e90e68c1
font_02_sfnt_off00014536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14536 12204 bytes
SHA-256: 244a9c5bd1f63e9d3923f4026ae660a8133ced3308a4b6683f92a3d1b7288243

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