Malicious PDF — malware analysis report

Static analysis result for SHA-256 897f84f4bf02c122…

MALICIOUS

PDF

80.6 KB Created: 2021-09-12 17:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 671f4e948e3d1adab16d1e682ded8091 SHA-1: a8b229cd886d2b482dc0dec018ce2c8b2e2bfbd8 SHA-256: 897f84f4bf02c1223876569eb839b60eb67843b70475257b9a864cb6853b60c3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm with numerous external URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ketchas.ru/uplcv?utm_term=pop+prototyping+on+paper+android PDF link annotation
    • http://stringladies.cz/userfiles/62507808653.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/fveobgcuv4osa7t6kpr89fclgq/dirigedizipofaruxabapev.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/baxokegutufugowivaj.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/bakobivegarivaverukuso.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/givotebasadulojaj.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/povumawiwazazukatubavor.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/32731678499.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/gokevikuwusiganusipefow.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/64677397389.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/webezifisojagubejowu.pdfIn PDF document text
    • http://lse.hu/userfiles/file/lotidozegi.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/panivubupelixafemiwar.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/rolexagurizonat.pdfIn PDF document text
    • https://fasaac.org/temp/files/39925528768.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/3392454779.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109121121101763.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/bokixibejasunikaropo.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/40881160831.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/ronevutojurujiwikapefejum.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fonad.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/69922580933.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/33530503639.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_off0000d5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AD 10468 bytes
SHA-256: 7b5545bee65fc124190de0384069cb5a8df396f6cb0c92abfa05968c9668041f
font_01_sfnt_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 18164 bytes
SHA-256: 07b09aebbd968c410fd626262b0a405aa1143ef0e269e7eec245a58f3d505396
font_02_sfnt_off00011cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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