Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a59301d19eb414d…

MALICIOUS

PDF

88.6 KB Created: 2021-09-12 10:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3dd032c6317fd4edb0be5c7b2d9da51d SHA-1: 6207cd36d1d8f071e00212096f92f800a348083c SHA-256: 3a59301d19eb414dc25bd0e9f3fcdf085a81587968c9388fe0ffe24395e77c0c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm hosted on disposable domains. One URL points directly to an IP address, which is a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://partnercable.com/files/4925556835.pdf In PDF document text
    • http://ciaomamma.hu/editor_up/89978069674.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210902101512.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/kufazovepiref.pdfPDF link annotation
    • http://okna-stv.ru/userfiles/files/pisenepizitub.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6b57284ab---90583067839.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/disezigifuvutuxinopururi.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/12431306588.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/55660498148.pdfIn PDF document text
    • https://medpressa.ru/files/file/tefukadavedaxisipo.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/82325979867.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/42432373672.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/24806515458.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/pabarajubabuk.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/11661576148.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0919762001631365571.pdfIn PDF document text
    • http://marymo.ru/uploads/files/47224276525.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/bigov.pdfIn PDF document text
    • http://vejwun.cz/images/gipenikowaf.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/dofokidojetixik.pdfIn PDF document text
    • http://rcmo.ru/upload/files/romimomazemurepefajasibe.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8aaafa8a146b597f7d859f7818955f8e/povaxinipuziladumikigituv.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/kivasumuwadewikesepisu.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/82102391006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=where+to+watch+punjabi+movies+online+freePDF 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_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 17596 bytes
SHA-256: a8bc317a8680d05d514ca1f4c666c93042842ab7a56b1283ac446b2cfb2f81be
font_01_sfnt_off000122c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD9 11260 bytes
SHA-256: 10eb9f8eed65cce01608626b9551f943e814f51714d68535ade056b0343faa0c