Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a670e0b621a7c3e…

MALICIOUS

PDF

79.9 KB Created: 2021-09-22 14:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ed9be0becfa5be33db199299c908da2 SHA-1: fd57efbd8c279dcfc20ff3fbfc295e3359fa92df SHA-256: 9a670e0b621a7c3eb45a8dc4c30174b625c4d203548a0ab362ba13c0ffa5db9b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are likely part of a link farm. The primary function appears to be redirecting users to potentially malicious websites, consistent with phishing or malware distribution tactics.

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://gestcargo.com/uploadfiles/file/49599677636.pdf In PDF document text
    • http://oa30us.com/userfiles/file/22246112474.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/towilagawipapitu.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/fuxapenufe.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/xumibetodeguzoresodasan.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/56902393985.pdfIn PDF document text
    • http://skrn.cz/pic/file/50727709092.pdfIn PDF document text
    • https://thehouseproduction.net/file/sepamofo.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/98750044707.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/61512725609.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/72861470800.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/38976582183.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/23898713047.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///10426516577.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/e7dca3205b5472c577daf814a0b3eb6b/79864938519.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/87013328079.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/65858796527.pdfIn PDF document text
    • https://wittnebel.dk/file/vumof.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/58366076589.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210921_F9A26CE60E436379.pdfIn PDF document text
    • https://gangnampools.com/contents/files/48789742924.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/zefimiwur.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140584917880---83645249910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=memoji+video+androidPDF 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_off0000d5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 10284 bytes
SHA-256: aef34524393f4ad56d1974bbf1b0c3006f6889f16db0da007e24bc08ec57b66b
font_02_sfnt_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 17552 bytes
SHA-256: 551d84dacd37777f79bf4df50851569371160a121497331644a052f50fa31091

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