Malicious PDF — malware analysis report

Static analysis result for SHA-256 97680a9b0e325c74…

MALICIOUS

PDF

82.1 KB Created: 2021-03-14 03:52:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 56a352f0d76d2a18157c5b49c08b5173 SHA-1: 569d782bcac328d7e4b17c8dd0403ba2db01f857 SHA-256: 97680a9b0e325c745a40ef57fe595214f0f2f02f086fd11f02ce88d44d07d407
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 0.9998

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://vilenefex.ru/award?keyword=pdf+bestand+verkleinen+acrobat PDF link annotation
    • https://cdn.sqhk.co/kofosenolo/jjyN9Za/xafabu.pdfIn PDF document text
    • https://cdn.sqhk.co/jesuzedavoti/Ggueij9/46195524049.pdfIn PDF document text
    • https://cdn.sqhk.co/tizalenifo/7BeiMhi/geometry_wars_retro_evolved_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/wozejodes/igHL5vT/gang_clash_mod_apk_download_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/vemudumuxixu/fjeABfh/rank_1_matrix_eigenvalues.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/toxobomegozovu.pdfIn PDF document text
    • https://cdn.sqhk.co/pilupenemima/QhdgeRU/demazif.pdfIn PDF document text
    • https://cdn.sqhk.co/gumorefose/jr5hijf/30083141946.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_199da9825a574888abdb0b1722919ca7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/georgia_khevsureti_travel_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8646d90-e929-4e7a-a98b-62a9d72b2c12/46491167437.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/aberdeen_emerging_markets_equity_fund_fact_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35de0e12-90b1-489b-aae3-22eab81c3f0a/nuwojun.pdfIn PDF document text
    • http://popofisofol.myartsonline.com/what_are_the_qualitative_data_analysis_methods.pdfIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_03cd06ca7eaf4466b226503b7bc3eb71.pdf?index=trueIn PDF document text
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_6c1ee7443b69454cb82b8e34356baf54.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/10d115ac-6acd-474b-bee9-5d8a53461bb2/98373523493.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a72703b-eed8-4d1a-a269-a7aaa45331c2/44351315086.pdfIn PDF document text
    • http://tijuvewoduga.onlinewebshop.net/32926682035.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/34376213207.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_off0001062e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 5280 bytes
SHA-256: 018a0fb20a05008fd04886f6e03003f5a5701e959189c2b6c125c15daab48aad
font_01_sfnt_off0001183d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183D 10452 bytes
SHA-256: 59ce41d7a2013e928438cb4244497ff527538d6a1c64611351cf8a332dd51e9e

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