Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f542c934436e6c8…

MALICIOUS

PDF

75.5 KB Created: 2021-09-28 13:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11ced687416958ab47e5ce596885e498 SHA-1: f3dd5fb8c1f2628f4285c8fdb5e796399318544b SHA-256: 7f542c934436e6c850fd1c453970ccbc04e949d283e8f71cfc9e01ff42333700
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of phishing and containing numerous embedded links. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, with many links pointing to disposable hosting and using UTM parameters, suggesting an attempt to obscure the true destination or inflate search rankings for malicious content. The presence of multiple unknown reputation URLs indicates potential download sites for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://ipost.mn/ckfinder/userfiles/files/33293073026.pdf In PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/24187204014.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/xupedalofasadovisaw.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/25015888895.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/90957199291.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/33599143458.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/tagajafukikuvotiripin.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/sunosijeb.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/bizoravusulegonezusojev.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/munila.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210908140714.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/30923461570.pdfIn PDF document text
    • http://travellerisland.com/files/47994648021.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/47ce4f4b067cafcf6b0eb320279447cc/rikawifir.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/83819591580.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/52496776100.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/noviserejozukaw.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142eaac6032c---18885656313.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/77826313559.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/84783425748.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/27790340829.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/nakulevakogisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=dream+league+download+hackPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000beb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CE 10736 bytes
SHA-256: 406d2974c32437fc4bb83c4e5a5c936e284e4bb7a617e6d6509bb2b62e8105cd
font_02_sfnt_off0000ef17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF17 18964 bytes
SHA-256: 7c0dfa38c56cfefd2b684f9f49b6240f6309427441d89368c1b617da4b552102

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