Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc3fdeb316f381e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 21:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3220b2db20193d0e1c84e73e3f8e0dd9 SHA-1: c6f065be97b4fb491c272f252da655265ae45064 SHA-256: ccc3fdeb316f381e298d4e1418f12fda75062b60460b5e7b8d3e29bd85286f33
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding a large number of external URIs across various domains, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coretry.ru/uplcv?utm_term=horizontal+and+vertical+bar+graph PDF link annotation
    • https://plewmal-d.com/Uploads/files/fajagujobonunenewititu.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/d546gpioltc02gh25fjjmr65e5/69941792333.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/82851252045.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/febokerujegigexej.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/89288170785.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/dumamutade.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/27312030044.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/9014109551.pdfIn PDF document text
    • http://foxdigi.com/userfiles/file/mawizidasofikovaliva.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/raromewu.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/sakuzapopagawexuveretizo.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210904_8C0A5AEB038AD942.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/59822740672.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/13675155579.pdfIn PDF document text
    • https://subded.org/userfiles/file/70942615444.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/7984179864.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/puposiwovezir.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/57132965551.pdfIn PDF document text
    • https://europartner2.pl/uploads/8544920076.pdfIn PDF document text
    • http://kco.su/userfiles/file/17927302883.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/36875865526.pdfIn PDF document text
    • http://koala-al.com/d/files/4488706275.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/737f7e10944c9006c41330108e9628ff/52769063074.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/76116441021.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/wefexodidedazim.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_off0000dc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC40 10880 bytes
SHA-256: 5002b85f6a4cd203c74a50453fca5a1568e43a9aea196d91d5a536955a183900
font_01_sfnt_off0000f4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 17108 bytes
SHA-256: 937b0aa05d309f893bc99bc7e25730a9897801da2d3ff5749749940618522b3d
font_02_sfnt_off00012172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1