Malicious PDF — malware analysis report

Static analysis result for SHA-256 9726944a4db51415…

MALICIOUS

PDF

79.4 KB Created: 2021-09-10 10:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 51006fa74b7fb3dd94f7458c173e56cc SHA-1: a04a468ff02e8686e87f574fe6a0fbd9e16e0a6e SHA-256: 9726944a4db51415ecb5c0b6aee49ea2ff39f358d427c84ec7b8b69440186d00
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The presence of numerous embedded URLs pointing to various PDF files suggests a link farm designed to redirect users, potentially for phishing or to download further payloads. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://isigakizima.net/img/tmp/file/sozixowaxezuvuvososu.pdf In PDF document text
    • http://mijn-nederland.nl/userfiles/file/62474786046.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/79003250334.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7c5e7c017---34650823979.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/fukusogagenunitibanijopeg.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/fuvuguzoxuwedemu.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/jijemazuvivaxumiropu.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/tubemugawo.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/99734153610.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/50631611625.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/4u91bnjimcpc6ls60t8bhsfrti/86899214526.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96755787890.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/kejij.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/jedemozexogozujolupi.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/wapadozumovu.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/64041288674.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/33995720528.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/44953937786.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/merijizasu.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_09_03_52_49_7184.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/60271491751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=apps+must+have+in+android+phonePDF 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_off0000d123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD123 17876 bytes
SHA-256: cdc1dd02796eefdc16b7ecfeffafcc526359773ac23ffcdb49875fb72b4b3cb3
font_01_sfnt_off0000ffe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FF 10756 bytes
SHA-256: af46ab77519348b11b936c0c7364a71de4f510d33ff5d31f31c14694b21468b2

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