Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08b73f1ce214328…

MALICIOUS

PDF

90.9 KB Created: 2021-03-13 15:28:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83dbcd488749d8e94a0a3468f9e704cf SHA-1: bcacfa6c1d1b5303e4af4a37b3c21bd6b6bbe62e SHA-256: c08b73f1ce21432883f3265516a4439be5d20b4c21ce62d368bd6f5b2bb3007b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for SEO manipulation or to distribute further malware. The embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=how+to+start+a+life+coaching+session
    • http://trokot-tonirovka.online/maths_worksheets_for_6th_gradey5v4v.pdf
    • http://sallles.ru/gifovovoxabevofewr1x02.pdf
    • https://pojozuwowate.weebly.com/uploads/1/3/4/6/134631913/14dba.pdf
    • https://duniterete.weebly.com/uploads/1/3/4/6/134690204/7491727.pdf
    • http://padlamadla.site/alphabet_matching_with_pictures_worksheetvfm0h.pdf
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/4965931.pdf
    • https://lilususuki.weebly.com/uploads/1/3/4/3/134317990/warixozoxaxaxemages.pdf
    • http://dkblogin-de.com/zowevugaorh7b.pdf
    • http://kopogaxepaku.sportsontheweb.net/plantronics_voyager_legend_bluetooth_not_working.pdf
    • https://memudodonimik.weebly.com/uploads/1/3/1/4/131406547/kirodutetezisawoliv.pdf
    • http://faponabon.mygamesonline.org/92860683213.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_8c9a805615474d88a364bb5aaefb8df2.pdf?index=true
    • https://s3.amazonaws.com/gazivemon/fulegigobojakirev.pdf
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_7ec50ed238a34dc897e9efc4f0a4e295.pdf?index=true
    • https://s3.amazonaws.com/futamo/piriwevozemuvedisuku.pdf
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_b029d2d5cdca49838bded41bd1e062eb.pdf?index=true
    • https://s3.amazonaws.com/mejifavo/boracay_budget_travel_guide.pdf
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_04a8c42867a94adf816fdf4f0800cc1f.pdf?index=true
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_32297ea3117644128f87253218063230.pdf?index=true
    • https://s3.amazonaws.com/lodazojamuva/dmv_ny_form_802.pdf
    • https://s3.amazonaws.com/fibesezati/robudeta.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106af.bin
104b5b895d78b782e823fcf4ad505ff4e57972ec12a65c2ed1b7cb29b813394f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 5196 bytes
font_01_sfnt_off0001185e.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1185E 1800 bytes
font_02_sfnt_off000120ec.bin
cf83abad7738fe00f7337bf507551e788d36b4b5d6e1edb86da9c79116a052d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120EC 10856 bytes
font_03_sfnt_off00014618.bin
531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14618 16312 bytes

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