Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2507fb364e7fac5…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 21:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3565501828500f1917c1b8d6f24b42bd SHA-1: d0c528f0db7f6a4513260deff03f5b769198f917 SHA-256: f2507fb364e7fac5f211be0d59fc3d0f84c1ad185a9ae243ee72a93dc02e517b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to 'infrive.ru', which is flagged as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=fortnite+app+for+android+phones PDF link annotation
    • http://inwallendorf.de/userfiles/file/55067941757.pdfIn PDF document text
    • https://duvanco.be/docs/files/rufivobabesujimuzemone.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/50092364824.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/nujulokuvob.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/28552188705.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/libefukowosufurutoga.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/11796259721.pdfIn PDF document text
    • http://saint-party.com/media/file/zuvupamunojekupatudovalim.pdfIn PDF document text
    • http://goldia.cz/data/file/85782716520.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/gejupomaxeluturumojivukow.pdfIn PDF document text
    • https://la-klamm.org/Files/files/buzedexadosebufota.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16150345a77ad1---vapukarudame.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/tujugodanixolurakevumijuk.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/55379804114.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/15151536657.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/budoforedevemizuruwuzuzop.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/39566700061.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/41423066668.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/66979414953.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/xebejoxevofitadu.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/kidesapuka.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/58c7a347251392bfcb51f546e984a1e6/44239785807.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/juvizitivezusaraze.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/zijovezajedowofapetubu.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_off0000b11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11A 15664 bytes
SHA-256: 320347bcb44e4cd1bd292ae04b079dc5e40e20964d4e0689d5d83b2a2c481209
font_01_sfnt_off0000d88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 10524 bytes
SHA-256: c631a54e5967a4f6aae97cdf1163d6acbc0989de72906e4defacf7974d36da51
font_02_sfnt_off0000f06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1