Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff7c79918f6d7fc…

MALICIOUS

PDF

73.6 KB Created: 2021-09-10 10:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dbd4144bf970bfe99b63f20e47196528 SHA-1: 0efb56ff790ac5a84ad4e96d5e306113fe6c702d SHA-256: 9ff7c79918f6d7fcbc0e418acc1280034b7c51237942ef20cc256c67466ca72d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, suggesting a phishing or spam campaign. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://jokerprod.net/userfiles/file/84912737784.pdf In PDF document text
    • https://ibericadearmerias.com/file/didaluj.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/barabodiziwiwamopepud.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/51254228588.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/dozodoniwadubifuwu.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/77045201116.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/kikunobomudowunegitazokof.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/mebatewefesopakabon.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/xuzikajaduwukupig.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/lelen.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/70168958166.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/1929081854.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d5a40f9c1---53822557271.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/mevolenagufubemeji.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/38095594249.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/wibovesad.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/80227372126.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/naridibisaposimuw.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/ruwemumozosokolepe.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/43706507823.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/50135864984.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/zibamuk.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/65553476129.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/4382898086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=breaking+free+piano+pdfPDF 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_off0000c0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A5 15652 bytes
SHA-256: b9b4e2291f46ccff751b44a57d9582c5d9e8e879d7e80a0689a530b430d5ae0b
font_01_sfnt_off0000e8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CE 10508 bytes
SHA-256: c3b319842056a1802c4450aff6dd0d2841d9a5ef4790d5de3e1d230149c2340d
font_02_sfnt_off00010095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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