Malicious PDF — malware analysis report

Static analysis result for SHA-256 922660a17050a112…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 17:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fc4a846efe6af162ac1f1aa664e2478d SHA-1: 6ae4ed2901caf9605744e3a4f332558243dd402c SHA-256: 922660a17050a112774873d60fd449a58744ca9f2f2a8b64c46a283ffa474838
134 Risk Score

Malware Insights

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

The sample is a PDF document flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious or disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the document's primary purpose is to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://brs.jo/userfiles/files/wexobege.pdf In PDF document text
    • https://muguet.fr/sites/default/files/file/87942166125.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/pewokuwatetujusajajubid.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/vonogapev.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210911005013.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/51217801550.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/53786814029.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1630755148/file/weminipap.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/18981324463.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/26888312104.pdfIn PDF document text
    • http://wuchem.com/upload/files/joliwonoxukawesanenuwi.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/zonusugesu.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/21405549936.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388e70d31a4---levimow.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/ziparorenitideweverob.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/modebelolugemurotuxab.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/zosatewimipibubixufit.pdfIn PDF document text
    • https://birotex.rs/images/files/jojubij.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/34787180603.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/75779814316.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/44069085381.pdfIn PDF document text
    • https://plasy.com/uploads/file/60464966725.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613998caf2e78---joxobofuvewafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mortal+kombat+movie+3dPDF 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_off0000ddd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD7 16792 bytes
SHA-256: 5295f158abca3cd19e9480631287a8bf59442895f8d8ceab0b40a06fede21670
font_01_sfnt_off000108eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12102 10600 bytes
SHA-256: b5cb9e0544d8418df35ae617a4d69b6e6d924dafb048c2dfc811015739521bea