Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e998d21e7a06c9…

MALICIOUS

PDF

71.5 KB Created: 2021-02-20 17:12:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 894097db85d9b55913c709b3347093b9 SHA-1: 8c5b513bcec429b7e8cfe4ed26a622b6c8d9484d SHA-256: 67e998d21e7a06c9f0ad3a532df5ebdb1667e1adaf3809044168b985e84d981e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing trojan. The embedded links likely lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://druttle.ru/aws?utm_term=gopro+hero4+silver+vs+hero+5+black PDF link annotation
    • https://gibejeki.weebly.com/uploads/1/3/1/4/131438187/19af81b9f22a5d.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/Jhdujha/girogizupazitoxizanobiz.pdfIn PDF document text
    • https://cdn.sqhk.co/videmixolute/gfihKn4/zen_pinball_3d_ps4.pdfIn PDF document text
    • https://kabolonopatine.weebly.com/uploads/1/3/4/2/134265344/ff04e580a2e36f4.pdfIn PDF document text
    • https://xidolunojedi.weebly.com/uploads/1/3/1/0/131069950/muxonobiwufoxerujujo.pdfIn PDF document text
    • https://jurujixomegisi.weebly.com/uploads/1/3/4/7/134745805/5f3215ab97c3.pdfIn PDF document text
    • http://presentinsta.site/format_factory_online_video_converter42jva.pdfIn PDF document text
    • http://yogait.space/foragidelebuzudak4l8jv.pdfIn PDF document text
    • https://cdn.sqhk.co/gegenosuzun/77n6r5M/europa_league_top_scorers_all_time.pdfIn PDF document text
    • https://cdn.sqhk.co/jutalufelex/icsGIGR/civil_war_union_generals_in_order.pdfIn PDF document text
    • http://meetchat.space/cara_install_adb_android_studiokfkjs.pdfIn PDF document text
    • http://naturapple.space/patizavo2jjd4.pdfIn PDF document text
    • http://online-bestshop.xyz/angularjs_pass_attribute_to_directive_templatemm9ra.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/pegozegi/jet_of_blood_artaud.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/22225828853.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/super_sport_live_tv_app.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_off0000db5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5D 5528 bytes
SHA-256: aebbf2a04af2ea1642c13002decd196a08c4dd85ce7f7d5c9dafee8699401e48
font_01_sfnt_off0000ee35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE35 10184 bytes
SHA-256: 0ca8ad6d63db737920362ca8249f53cb640836b62bb47ed3039e54f224124045

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