Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf19df83c3e078c6…

MALICIOUS

PDF

75.2 KB Created: 2021-03-20 16:28:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5344f4dfcfc133949d2524aa8f8bb23e SHA-1: c7515dcebae05e2a4c6c4a8db9062a84a9f8d31e SHA-256: cf19df83c3e078c627b6f3d1edc4d4e54a61d8de3bbab09c1cddf53baeaefb84
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document that contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs, such as 'https://bologen.ru/strik?utm_term=how+to+draw+a+nose+super+easy', indicates the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=how+to+draw+a+nose+super+easy PDF link annotation
    • http://dk-inc.xyz/rexaweludepozotas6y1vh.pdfIn PDF document text
    • https://cdn.sqhk.co/kevovevude/djjgjsQ/fortnite_skins_coloring_pages_free.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwuwoki/e10gcie/small_fall_wedding_cake_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofidipo/jjijfhh/whatsapp_status_viral_video_tamil_songs_download.pdfIn PDF document text
    • http://mmuuue.space/why_was_little_house_on_the_prairie_cancelled_on_insp96phs.pdfIn PDF document text
    • http://trells.space/adjectives_worksheet_for_grade_58jldp.pdfIn PDF document text
    • http://tixshopclub.fun/death_parade_end_explainedf21bh.pdfIn PDF document text
    • http://wegoluxetas.scienceontheweb.net/elevator_pitch_examples_for_highschool_students.pdfIn PDF document text
    • http://mebevevi.mywebcommunity.org/11565669561.pdfIn PDF document text
    • http://mon-cmbretagne.com/ruvupuxiluwomulc16up.pdfIn PDF document text
    • https://cdn.sqhk.co/kumipexa/cjfFTiL/76758536872.pdfIn PDF document text
    • https://cdn.sqhk.co/suzagofi/0iighih/gutajidetavasigavagi.pdfIn PDF document text
    • https://cdn.sqhk.co/dudumadopole/tNhjDjf/balozin.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/how_long_to_dehydrate_turkey_jerky.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d53969b0-6f0a-423c-b470-3aea4bafc0b6/emergency_medicine_physician_assistant_salary.pdfIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_de501799f7204ca3b4c43fe5a724913c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47ffbec0-90f5-4a54-8137-a588cb73340d/kovat.pdfIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_933f96a102364e22847b3d148e6c08b7.pdf?index=trueIn PDF document text
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_d93a1d789dae48ce86e9104d17a969bd.pdf?index=trueIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_3fbaf5bc45ec4d0b8d8a76826e6cdc67.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_4e4d9ac9a9ca42cfbc482e2be7d689cb.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_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 5076 bytes
SHA-256: 420f3ce4e6c4d90fb4d27b13e79a3b7bd542cdc81a36af1e2c2a99914e13016e
font_01_sfnt_off0000fa0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 10540 bytes
SHA-256: 6f5a06d0164dc5bc19c0736d36aa9e690e17e5695cd744daa93dc530ab589dcf

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