Malicious PDF — malware analysis report

Static analysis result for SHA-256 9409ef7f458b2a0a…

MALICIOUS

PDF

77.7 KB Created: 2021-05-03 12:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 527a9811fdcf795cce88076e152506e2 SHA-1: 12da34455046228ef51d36bb4c63fe3dd92f3a3b SHA-256: 9409ef7f458b2a0a3d1f2e2d510407d3282d7c51b3f8d52a27296d269a18fc17
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier further confirm its malicious nature, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://gimoguvi.ru/strik?utm_term=best+undercounter+ice+makers+2020 PDF link annotation
    • http://fruitslope.online/86527487972q3lib.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459774/normal_601e0ffd79663.pdfIn PDF document text
    • http://lopixerirerenex.mywebcommunity.org/barbie_princess_coloring_pages.pdfIn PDF document text
    • https://cdn.sqhk.co/kidobogi/1hhC7hh/flowering_plants_worksheet_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393485/normal_5ffc2b6b02972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_603f8adaaeeb2.pdfIn PDF document text
    • https://cdn.sqhk.co/wiluxuko/ehgYUhb/vozatozaropopijijoxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470226/normal_600720dc7317d.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/kghhfB8/plants_vs_zombies_heroes_mac_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rajexizeba/iclFgjq/stick_fight_2_supreme_stick_kung_fu.pdfIn PDF document text
    • http://wozilimesiz.mypressonline.com/12942184617.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447669/normal_5fc6f074471c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gipebevu.atwebpages.com/17_sdgs.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_11a6dce43d6a4063943d76c98e5d4496.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/53875022413.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/sunazepesoga.pdfIn PDF document text
    • http://wegamaluperetuj.atwebpages.com/55575153921.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/63749058205.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/standard_form_and_canonical_form.pdfIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_4ee5d839ed76417bb5782d871edd8eea.pdf?index=trueIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_7a99c6e1ed4e4494a6db1ae163af91e6.pdf?index=trueIn 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_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 5440 bytes
SHA-256: b7dc057aa9897077c2d6d78fd85daf8c1b0fcb0aed1165c702cb5e7124e2fd06
font_01_sfnt_off00010330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 11348 bytes
SHA-256: a75b81e4b412dc5b9919bd6dade90c1173835aaa7e8cb8bec6db2bc78b524593

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