Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1650e7f7fd5d62…

MALICIOUS

PDF

68.5 KB Created: 2021-03-25 12:09:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2199bcc693e521fe0b94d5f75868460f SHA-1: d6a2b6aa6d4c1e56e7979c4b9a990030514d1d92 SHA-256: cd1650e7f7fd5d6211ba52dee5e825a9628769b4c9cf162577f68c75ceb5bef1
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external URLs disguised as relevant content. The primary URL, 'https://ponafet.ru/award?keyword=spanish+grammar+in+context+pdf', suggests a deceptive SEO strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these linked resources.

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://ponafet.ru/award?keyword=spanish+grammar+in+context+pdf PDF link annotation
    • https://cdn.sqhk.co/batumozi/AghVfhg/jowawudi.pdfIn PDF document text
    • https://mesaxejako.weebly.com/uploads/1/3/4/0/134097573/2853904.pdfIn PDF document text
    • https://cdn.sqhk.co/kumotuxijufu/jgfiihh/pocket_league_story_1_apk_mod.pdfIn PDF document text
    • http://allfreebets.ru/astm_a106522kyd.pdfIn PDF document text
    • http://ru-payment.casa/a_class_may_have_this_many_default_constructors3tjd6.pdfIn PDF document text
    • https://cdn.sqhk.co/takivelalam/7DKS0hi/android_sdk_versions_market_share.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/Pwiihd1/nubadabikunuraboz.pdfIn PDF document text
    • https://pupalajapifev.weebly.com/uploads/1/3/1/4/131454396/rurogubepo-xilifale-bofazopeguputi-leweto.pdfIn PDF document text
    • http://itdiscounts.info/visupifelemaxegun5o00.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/fidgegj/53498285452.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/cjbieha/spaceflight_simulator_mod_apk_1._8.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxeromewime/rjiRmoD/what_does_just_drift_away_mean.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/9FgYhhk/16719691496.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/ifgK7gg/texas_longhorns_logo_svg.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/oziXhex/speedometer_cable_lubricant.pdfIn PDF document text
    • https://limejanokevipa.weebly.com/uploads/1/3/0/7/130739330/3462659.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/DlgjgeO/vegas_oddsmaker_salary.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/146c14ff-44ee-4682-87fd-8880624b3977/51162561129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/919dd512-c0e4-47ed-b3ac-74de84e17d16/what_hotel_was_used_to_film_the_shining.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e31ad31-b55b-411e-ba34-da565b0e5ce6/35978634132.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_off0000cf7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7D 5708 bytes
SHA-256: 9445e762254ac96dfda9ca9e76c053c7c91b0839fc55db0daa9492e3a12d4d57
font_01_sfnt_off0000e2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 10092 bytes
SHA-256: 084a6e215d210504dafb98f7e5446dfcc71d1f9a9429e1d1067992f9353b607d

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