Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c637f45a3363405…

MALICIOUS

PDF

73.9 KB Created: 2021-09-22 10:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1476c298172e6bbcaad5e12fea2ca74c SHA-1: 847cdabb32f6e4d23f677c8e48f084e081333341 SHA-256: 6c637f45a33634056669e9fb76a6628e5827c970064d78896ad89b80a10b3869
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external links, including one identified as a link farm on disposable hosting, suggests a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://willajarmar.pl/userfiles/file/32156802670.pdf In PDF document text
    • https://themis-lex.com/userfiles/files/gedalivigomonoxokab.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/89067541774.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/zudiwowijepowixo.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/64703217392.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb3a74b6e8---fevubebobitogumafibig.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/91336219457.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/80306814036.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/238fae77e8868f6cbb38e9c6bf5ed491/gokavuwamusewawoti.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/gajubegerikaxuzu.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0518885001631087708.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/63238808859.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/91368207932.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/mekojukekaxid.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/gomadirulizinuzolo.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/vifowabazugenibutidaj.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/retowamel.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/nufibesiwegesagu.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/17407978832.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/melowitokeforinu.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/benukovatelimababal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=iphone+touch+watch+price+in+pakistanPDF link annotation
    • 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_off0000bc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2F 17044 bytes
SHA-256: 479d237d358e6e13266d78520536bed04088de7eb05def0dd0cee1a86295b262
font_01_sfnt_off0000e853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001006a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006A 10652 bytes
SHA-256: 5c7db1746e130adde9b9c85b7ca8ae7794ea4b4036b6f60f0b6577501a4d29a8

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