Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5261bdb0d04a1c0…

MALICIOUS

PDF

73.2 KB Created: 2021-03-30 08:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0cdccf382694c2a74f38bf21d11df12e SHA-1: 29e6fdef114417faa614636137b5a93e91994ec6 SHA-256: e5261bdb0d04a1c0bacb5b9d6d5581072ef3d04b9b7af5193e876b57cc1a8118
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-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://baarspo.ru/strik?utm_term=alberta+health+and+safety+training+institute PDF link annotation
    • https://cdn.sqhk.co/vonewesipan/hi8jjYc/free_midi_chord_progressions.pdfIn PDF document text
    • https://wudavatu.weebly.com/uploads/1/3/4/4/134457778/4269988.pdfIn PDF document text
    • https://cdn.sqhk.co/tikugubobo/dicibhi/jepakukobobesagekut.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/gjCghlH/wurigavenumulimolaveje.pdfIn PDF document text
    • http://physcoo.com/can_iphone_6_plus_be_upgraded_to_ios_13az575.pdfIn PDF document text
    • http://gatorama.fun/rayovac_ps13_charger_instructionszznx7.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/o4rijjg/golufazesaxu.pdfIn PDF document text
    • https://cdn.sqhk.co/fitamorigob/bhgibhc/amazon_free_shipping_on_everything.pdfIn PDF document text
    • http://euromarket.pro/o_existencialismo__um_humanismo98hlx.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/gjgMSjg/zurepugu.pdfIn PDF document text
    • http://remont-kholodilnikov.website/smart_you_tube_tv_baixari170a.pdfIn PDF document text
    • https://gejejemimegi.weebly.com/uploads/1/3/4/8/134899280/24841d3a1d86.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/jirebonudur/9410108831.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/54694958760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/582edab3-ab44-4f35-b4c0-376b07f2c7ad/how_long_is_each_ddp_yoga_workout.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f7e18be-b37e-495a-a3d0-3096310cb0f8/wordpress_admin_url_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/latosofogokuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1d818d7-5da5-4b70-a2b7-491de3bd8be2/tosunawawebotilonasuneb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd388078-3b2e-4660-ad45-2b87d7058674/does_the_force_of_gravity_increase_with_height.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_off0000e064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 5400 bytes
SHA-256: b8bf0b077c234037cdf93533e8608ac83c369f46a4259ed63960d219da192a02
font_01_sfnt_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 10684 bytes
SHA-256: af9132fb691c835b566b474975cf035955caa88e75aeeaa89762addd599d8fa2

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