Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f42f5891e5b0a9…

MALICIOUS

PDF

79.4 KB Created: 2021-03-09 08:21:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7a08328c5dbf20efe6bda01abf576178 SHA-1: 1014fa30aff4eb84fde5621e28e83bca9a36703b SHA-256: c3f42f5891e5b0a921134d8124604633ba9e4536db5d9e762a87fed22940b6da
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xezojetit.ru/award?keyword=map+of+asia+with+countries+and+capitals+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452621/normal_5fc5c2d19343f.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/jjOz4ig/best_hoverboard_in_subway_surfers_2020.pdfIn PDF document text
    • http://wiinorama.fun/86922146722iq3yy.pdfIn PDF document text
    • https://cdn.sqhk.co/joxutedunik/ibznhdY/baby_phone_number_whatsapp_link.pdfIn PDF document text
    • http://smm-target.ru/what_are_the_positive_impact_of_globalization5edmd.pdfIn PDF document text
    • https://cdn.sqhk.co/fefavezevir/hhhfggp/josawasoxefofufi.pdfIn PDF document text
    • https://cdn.sqhk.co/guzikiku/igfhhjc/kabilanepawoxuvo.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/hbjf7ii/extreme_moto_racing_game_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448980/normal_5fec9877cb1af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417024/normal_5fd638a60cf78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449603/normal_600a28fb42299.pdfIn PDF document text
    • http://coolstudent.space/social_media_marketing_thesis2n0us.pdfIn PDF document text
    • https://cdn.sqhk.co/gugapedulob/4gfhahj/masterchef_australia_season_7_dessert_recipes.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/gjpa6jj/dude_perfect_youtube_overtime_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450242/normal_6041e097561c6.pdfIn PDF document text
    • http://draiwenstore.online/62427855547fra4q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_70afc47d67a14a7aa51284322a2cad36.pdf?index=trueIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_a61738c1e0254a0a841e7167c94924bb.pdf?index=trueIn PDF document text
    • https://95115bc7-74e8-4406-9c5a-15d8488655f5.filesusr.com/ugd/b81754_2ff2ae849133492894e7e41a748389cd.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 3196 bytes
SHA-256: f10786597defda12707ee5c2b61023f1a12ea5bc72b127f3a9bd42780cc8ba34
font_01_sfnt_off0000fa23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA23 5340 bytes
SHA-256: b037f2e7d8f7224c4419e2e45ef3baba3ffe383c561c97c954dd9e2ecca452a7
font_02_sfnt_off00010c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6A 10448 bytes
SHA-256: 55a0369ffe0444ee6ec5af80e45b09f169ff4f43f79b0454df2ac161f09379ce

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