Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8ec8b2014b35f5…

MALICIOUS

PDF

80.2 KB Created: 2021-04-11 19:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a73618c8abf24034aa04496c2ca04c5b SHA-1: 204909c3b1f6e5e3ff9738133437f87180cb8034 SHA-256: 6e8ec8b2014b35f5214dc902429d5b85f8fd8db93572da1b6c448a81fb4d4336
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to suspicious domains, and is flagged as a link farm and a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit user trust through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/strik?utm_term=hayward+power+flo+matrix+rebuild+kit
    • https://fupefasupemeze.weebly.com/uploads/1/3/4/3/134315788/nofok-tufazinex.pdf
    • https://kilekawu.weebly.com/uploads/1/3/4/8/134857711/3a584d.pdf
    • http://evromotors.net/gotalk_express_32_boardmaker_templatepqmgj.pdf
    • http://siondez.ru/800442947170j7t9.pdf
    • https://cdn.sqhk.co/pagozixupezi/VgfZLic/15413042897.pdf
    • http://damita.fun/31379281346mj7gd.pdf
    • https://cdn.sqhk.co/linidivez/md2wgda/ritopavuziw.pdf
    • http://securitycheckingbrowservkcom.xyz/is_hamilton_beach_a_good_toastergg2gk.pdf
    • https://cdn.sqhk.co/zirixegip/Jjfqmgi/best_free_ringtones_for_iphone_8_plus.pdf
    • http://tekplafond.xyz/how_to_install_insinkerator_evolution_spacesavercbabg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/99aed5ba-71a2-4699-85bd-aa3f48fc4a4e/nezizabadisexinapifavos.pdf
    • https://uploads.strikinglycdn.com/files/a398f356-fc64-4e90-8e54-dfd5889c174a/44237541780.pdf
    • https://s3.amazonaws.com/zamuriza/22107653388.pdf
    • https://s3.amazonaws.com/kudufigunabi/tintern_abbey_summary_slideshare.pdf
    • https://s3.amazonaws.com/pipaneku/how_to_adjust_di2_shifting.pdf
    • https://s3.amazonaws.com/bokexizometun/wumejuzagakawemenowofiru.pdf
    • https://uploads.strikinglycdn.com/files/2e308279-2a95-49a6-98cf-21f574580625/nedutewanerobuze.pdf
    • https://uploads.strikinglycdn.com/files/da5b4079-e92b-4085-82e7-be15197b55ab/jexosexupirunufo.pdf
    • https://s3.amazonaws.com/dogevazapiwediw/mazaliguzavimuwatolitora.pdf
    • https://s3.amazonaws.com/retisovojor/bogutagafabubes.pdf
    • https://s3.amazonaws.com/gixawetopoli/assoluto_racing_mod_apk_offline.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eefb.bin
cf07500bf282d55c9ea2afd6c9f70a7891e223e3f6fd3ef98f7c50c883892696		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 5212 bytes
font_01_sfnt_off000100d2.bin
3ebea4a14b9980c24778f6b3678912ab608f7561b5e7e583521b837dc014f69e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100D2 10732 bytes
font_02_sfnt_off00012582.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12582 4324 bytes

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