Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e907475b5dbdb43…

MALICIOUS

PDF

83.7 KB Created: 2021-02-19 01:09:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f8faff0028477731b65fca7734c8d589 SHA-1: d4cbf6f13da0ad3a859f27f40b3c261359929c89 SHA-256: 8e907475b5dbdb438509ae2ed9d4398118d02503f282a725f54f761d06dd9fc4
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 links pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely leveraging techniques like spearphishing attachments to deliver this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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/123?utm_term=seasonality+define+business+studies+as+a+subject PDF link annotation
    • https://cdn.sqhk.co/numavagoko/xMUJiia/ligib.pdfIn PDF document text
    • https://cdn.sqhk.co/saboretiki/d96Hiax/ninja_sushi_mililani_delivery.pdfIn PDF document text
    • https://cdn.sqhk.co/nijijitolow/dEihhcy/removing_waste_canvas_for_cross_stitch.pdfIn PDF document text
    • https://vivexizakodol.weebly.com/uploads/1/3/1/4/131483194/2237762.pdfIn PDF document text
    • https://kaxamutibe.weebly.com/uploads/1/3/5/3/135348628/a2a95cd0f4be0.pdfIn PDF document text
    • https://nasavizar.weebly.com/uploads/1/3/5/3/135322571/womunikujavasezezin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387933/normal_5fff164e59449.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/WNidmB8/best_new_ringtones_2021_free_download.pdfIn PDF document text
    • https://nelemiken.weebly.com/uploads/1/3/4/7/134704654/birezotupobowezux.pdfIn PDF document text
    • http://vamoktin.ru/espn_mlb_schedule_dodgersfd4qo.pdfIn PDF document text
    • http://winoorama.fun/bhc_full_form_chemistryr3w0g.pdfIn PDF document text
    • https://cdn.sqhk.co/retesixabe/kgjjfjg/kinojuma.pdfIn PDF document text
    • https://dikemogegopur.weebly.com/uploads/1/3/1/4/131406608/vikulijowu.pdfIn PDF document text
    • https://cdn.sqhk.co/dalegoti/pged0rL/nokaju.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/ifESiaF/shelter_island_san_diego_ca_hotels.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lupebesu/pugatuwuxuxemizatefalafub.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/gta_vice_city_cheat_codes_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/challa_uri_movie_song_ringtone.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FA 5224 bytes
SHA-256: e77aa743d5c7bc853387cbfc14924c130cdd1a329c181f0e2b80c1c26ef226ca
font_01_sfnt_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 12332 bytes
SHA-256: 08745ac57fb0a4f78d4b76744c0b25050607220a72ae5a44107e53d6a9594307
font_02_sfnt_off00011e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E27 16112 bytes
SHA-256: 275d0ef8f619a30f75d5b67021c85ffe51dbf44d82a44ecb2d07128ff93f9399
font_03_sfnt_off000132f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F6 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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