Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd590d024c82dc5…

MALICIOUS

PDF

71.7 KB Created: 2021-02-22 22:52:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 80ea21ff8f8ec77cf23396323d57f13d SHA-1: 8e72fe8ba40c154ae81888d5eb2cacf97051bf3c SHA-256: 3cd590d024c82dc54c6edf284e4a90d22d24cd9839d4b8f9a6ff05eaa2e368ff
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://jottigo.ru/aws?utm_term=what+is+sustainable+development+in+your+own+words PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419818/normal_5fe1a546507fa.pdfIn PDF document text
    • http://palefazorubo.22web.org/jasper_reports_parameters.pdfIn PDF document text
    • https://nulebuset.weebly.com/uploads/1/3/1/4/131411431/9270280.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/VTjgidE/28227998120.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/cjevjEZ/flat_pack_homes_for_sale_from_germany.pdfIn PDF document text
    • http://oneitstore.pro/guidelines_gastric_polypsesds9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476281/normal_6027ecb5cea60.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/tcx0jbk/skyblock_roblox_wiki_bees.pdfIn PDF document text
    • http://mamivadusijuf.iblogger.org/baba_sehgal_song.pdfIn PDF document text
    • https://cdn.sqhk.co/salobosemiv/idcjhdJ/does_screen_time_include_apple_tv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383802/normal_5fe91053bdb8c.pdfIn PDF document text
    • http://kinorio5.xyz/44989478565arzow.pdfIn PDF document text
    • https://livesagu.weebly.com/uploads/1/3/1/4/131437401/vusipazakuduxo.pdfIn PDF document text
    • https://joletumutete.weebly.com/uploads/1/3/4/8/134871701/fewelinubagedaz-vofowifedirow.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/loranoduzuja/ayumi_hamasaki_album.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/delosowopilagobiwasoges.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/tata_sky_plans.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_off0000da1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1C 5608 bytes
SHA-256: c5520d1922e275bd74b4837c39f3be82c812cc38a92e0c248a12dc2e44e52f17
font_01_sfnt_off0000ed15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 10628 bytes
SHA-256: fe266c553511113301849fd143033daf6967d65d4208ff14144957e2f2ec35f4

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