Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbecdc4f186741f…

MALICIOUS

PDF

89.0 KB Created: 2021-03-22 09:14:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 221162ec7fdee730ca4a84e19ceb68ae SHA-1: d2f0ade5988fec8e79c9036ca74c18e4ab3a67da SHA-256: fdbecdc4f186741f7b522d880debba352389423346206de86aec168d4000b80f
166 Risk Score

Malware Insights

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

The PDF contains multiple high-severity heuristics indicating suspicious links and link farms, with one heuristic specifically flagging an invisible link to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • 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://zajinet.ru/wix?keyword=combining+like+terms+simplify+each+expression+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501998/normal_5fede29f405fe.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/vdkgghe/wivazorumejebiwa.pdfIn PDF document text
    • http://motivawka.online/how_many_calories_are_in_a_small_strawberry_milkshake_from_sonicas517.pdfIn PDF document text
    • http://lisolu.org/gupuvavuvoneraforijapp2v.pdfIn PDF document text
    • https://cdn.sqhk.co/vogoxaginoje/fIhgjgG/84077976813.pdfIn PDF document text
    • http://revershjtb.site/85969912223k65gt.pdfIn PDF document text
    • http://paksorond.xyz/27245410091xksw1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422914/normal_602855b413726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426073/normal_60522f15bcfbe.pdfIn PDF document text
    • http://alisaborodaenko.design/galutowelowdfrra.pdfIn PDF document text
    • https://cdn.sqhk.co/koxuzofu/bw49RAr/alien_invasion_game_xbox_one.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416490/normal_600c9b8744e03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379221/normal_6046f2221e536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452835/normal_6018a0d920915.pdfIn PDF document text
    • http://lnstagram-support.live/lexedejerosanajelikogoo5xf.pdfIn PDF document text
    • https://cdn.sqhk.co/mewuwemiromi/jc1qXgh/79169976176.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472475/normal_5fe38b194fb0d.pdfIn PDF document text
    • https://cdn.sqhk.co/tidilotofuka/cVhghbi/gujigusuduzazopubukatosi.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/ddhdihm/pizukiposozatuwegito.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/SggjaVa/zurogekupitovedajojugap.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/WWEibDq/41553545599.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 5704 bytes
SHA-256: 49897bca676bc44ae47d5d8030190c1a8ff584cb15d687eaaf83b30ad4c1bbc5
font_01_sfnt_off00010a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4E 12156 bytes
SHA-256: 821472c60c708dadfbc473184ba896d3edad1164236359f02f10c59a7bdf0bd9
font_02_sfnt_off000132d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D1 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2
font_03_sfnt_off00014798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14798 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378