Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d834080f4ef6e7…

MALICIOUS

PDF

68.2 KB Created: 2021-03-17 02:16:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 696274ae9d436bcd1fadc4e0029052cb SHA-1: f3066d711a50ae7ff97ec56773ed1ed0906a9217 SHA-256: 88d834080f4ef6e7bc5220f83042562d1dc03837530f6840a0ec652324aece4a
134 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 and presents a deceptive download button. 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/123?utm_term=principles+of+financial+accounting+solutions+manual PDF link annotation
    • https://vozunekoba.weebly.com/uploads/1/3/4/9/134902797/0cc82152.pdfIn PDF document text
    • https://sijujufe.weebly.com/uploads/1/3/4/6/134696532/movoripuzaruxugenini.pdfIn PDF document text
    • http://trylait.club/season_3_deadwood_episode_guideqisv4.pdfIn PDF document text
    • https://lewugudufe.weebly.com/uploads/1/3/4/6/134668986/dezedumo.pdfIn PDF document text
    • http://limecash.xyz/xanikugimeveucn2x.pdfIn PDF document text
    • https://memezuwiz.weebly.com/uploads/1/3/4/7/134702577/kevetuzo.pdfIn PDF document text
    • http://novijixonusasu.mywebcommunity.org/sifun.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/xowizudegametar.pdfIn PDF document text
    • http://tukomibewi.getenjoyment.net/english_prefixes_and_suffixes_list.pdfIn PDF document text
    • http://brosbass.com/21771519481dzcg5.pdfIn PDF document text
    • https://bewimesev.weebly.com/uploads/1/3/4/7/134753962/4493066.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/kefiperizonofu/14945291647.pdfIn PDF document text
    • http://retukazitoja.epizy.com/how_long_do_you_cook_sweet_potatoes_at_425.pdfIn PDF document text
    • http://xuxedawijepi.rf.gd/39881299476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bdadf9f-0355-48b9-8c94-fdf0d7572cef/19145873423.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/xexebelidogaviwez.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/excel_cricket_score_sheet_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/647cb2ed-f053-44ce-9347-d9a7a0a2ae39/how_much_does_pressure_washing_cost_per_square_foot.pdfIn PDF document text
    • http://tepisivud.epizy.com/90188361096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65de5703-4bf3-49ad-8c6b-c01c85dc29f2/sogutatu.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_off0000cd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD57 5336 bytes
SHA-256: f99ec955d63184ee37683a72897e4770615dc6af65e3dcb0a0ba87d7fba67456
font_01_sfnt_off0000df69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF69 10320 bytes
SHA-256: 238d78c8e54cda8339783613192ce8ec6a61158dcf4e4bd6355c83c064943a27

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