Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeff88fbee7a2497…

MALICIOUS

PDF

109.9 KB Created: 2021-05-17 03:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b2efe01bcbe90b7e101d9807b1c134a5 SHA-1: bc2898c8221cd0fa3563ef6a06db73adb486fbf0 SHA-256: eeff88fbee7a24972307a04adacdd7fe61e72e1950c4404760563e3797e6c98c
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it's a phishing lure, specifically using an image to redirect users to a malicious URL. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attack designed to lead users to a compromised site.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://lozipotod.ru/strik?utm_term=history+of+flag+day+in+the+united+states PDF link annotation
    • http://amsidgi.xyz/lagowajisavibufi04nve.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/jihgger/zombie_world_war_2_movie_download.pdfIn PDF document text
    • http://dmdmassage.com/108629700739tywq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458614/normal_5ff079e911df3.pdfIn PDF document text
    • https://cdn.sqhk.co/diwamukef/1NlSiep/75680236464.pdfIn PDF document text
    • http://coolvdomaion.online/sony_str-dh810_av_receiver_reviewtpwjl.pdfIn PDF document text
    • http://naturebiolog.space/31362055824yqnbz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379371/normal_600a29ec2a9de.pdfIn PDF document text
    • http://perevod24-card2card.site/are_jeep_libertys_reliable4pxbj.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/5fja7gc/ball_hitch_for_lawn_tractor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484355/normal_605fb80b82a76.pdfIn PDF document text
    • http://pearhaidhr.fun/dune_2000_miniseries_trailer7z461.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/wovugi/how_to_study_organic_chemistry_class_11.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/bulawayo_polytechnic_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/fleece_fitted_sheet_small_double.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/mujovubepedetu.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/fimata.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/biomedical_science_graduate_cv_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/how_to_clean_the_corona_wire_on_a_brother_printer.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/crossfit_ab_workout_no_equipment.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/72315102037.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/gupawawazox.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_off00017204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17204 5232 bytes
SHA-256: fe964336d0b01fe99fe424dcd08023e1a6b429bd81a70cdb20c0f176b82faebe
font_01_sfnt_off000183cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183CF 11288 bytes
SHA-256: 51c44d69da59a6a42549da0ffd97d5c1848eb304e9bab1f69b964abbb5554b5f

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