Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67f3f947620af09…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 04:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cf3e8b692aba914c3af5d69091abe66c SHA-1: 4d6fa8cc7147a9ce6efe99c61bbd2a512f0e3425 SHA-256: c67f3f947620af09ff6c26c83024db85e16a286eee497d154e017f4e0b2e0711
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URIs pointing to disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs indicate a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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://wastran.ru/uplcv?utm_term=free+comic+strip+maker+for+students PDF link annotation
    • http://atenngo.com/admin/sites/site/documents/70700279227.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/e8f988164b97fff72c135c9350a6ec25/gijoxi.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/jopurimowaxeralu.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/89373952152.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/jopujisipobopugawozibo.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161319df6e5449---veboputobopemibizoviminu.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/93810391012.pdfIn PDF document text
    • http://findacommodity.com/upload/file/72933581340.pdfIn PDF document text
    • http://minipit.com/data/files/vuremamumujagirefezexana.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/37032614665.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40535611400.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/xosasotusoze.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/bapuse.pdfIn PDF document text
    • http://cloverdiamond.com/file/67890073036.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/nojawebeke.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210911083623.pdfIn PDF document text
    • http://ashioke.com/images/library/File/nofujatunubuvekudawaxuwal.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/83154428512.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/23180392517.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/rogifusugebifabukubitul.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/vasimavogelevupufob.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/kokenizukomawugijikofil.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/sokim.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/96959884654.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 17460 bytes
SHA-256: c4bfda7b79fe857eb6e12d5b453046c00056d7a44f3ff3cb546a002e58e5cb72
font_01_sfnt_off00010164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001197b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197B 10904 bytes
SHA-256: 23660b9391007299c39060031cabe80f200f0be4c38adabf9c5f02f8926148f0