Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b96474a442301c…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 22:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cc099fa9e1f134ab1567db9988323724 SHA-1: c7158e11d83b2ef5381a68fff568787a0ae18728 SHA-256: 39b96474a442301caeefcededdc15146443b4e44d66ec16347515d0afa7f3c7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's used to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tivati.com/uploads/userfiles/file/dugovuxobabunimo.pdf In PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/jivumudorozejoxulebalu.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/1916309366.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/2f0c2d5a06c03f92708583347cd086fb/bazumuminofenajota.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/45771827104.pdfIn PDF document text
    • http://preiss.at/upload_files/files/pifuzawozanewipe.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/24165142974.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/wereturuwipajavakol.pdfIn PDF document text
    • https://huanghecables.com/d/files/timifevubejajojo.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/belubazusadi.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/gaxiketaloneri.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/583508b51f5b35037cacf964554cccc8/wumibopisezebe.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/5144811888.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/tovopimufuwuz.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/bororajuromiwupesufud.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/9825759800.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/699356903.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/75171875616.pdfIn PDF document text
    • http://teakdeck.pl/files/file/kitagajigefuravesebo.pdfIn PDF document text
    • http://parfumland.sk/upl/gabugemojuxunowomugedil.pdfIn PDF document text
    • https://chv.vn/userfiles/file/zexajuzakijaki.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/beresetenasan.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/fewunusuwaforogowi.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/84385149867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=geoquiz+android+studioPDF 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_off0000e122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE122 10540 bytes
SHA-256: 5f7f5fbf8172848022cd81e40fcd4a4f4992ca8d6aefa23115bdd893f59eb183
font_01_sfnt_off0000f91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91D 18500 bytes
SHA-256: 93df58ebbeb75d1f804f3faa1730c65bc0a8db38573ff024dfc5c4759e5426dd
font_02_sfnt_off000128e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1