Malicious PDF — malware analysis report

Static analysis result for SHA-256 1168894383817e5e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 08:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 08c6152e905fa85421dd2d631e23ed44 SHA-1: a1161d279a95f15e9910db289532d2f0d92cf0c6 SHA-256: 1168894383817e5ecd748708bae1aac13842105fa357a1480fed5f19b36888a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to suspicious domains, indicating an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links on disposable domains, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nomylo.ru/uplcv?utm_term=startup+screen+android PDF link annotation
    • http://bodegaadrover.com/userfiles/imagenes/21965238826.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/fb4ba0a5b08289d4f67ffed21e459a3d/83073424873.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/ligojuwumepukitirufugakap.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/41111526669.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161431a649ab4d---86399520777.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/vilokipisomiwej.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/2200577957.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/perapuwabasakebololave.pdfIn PDF document text
    • http://poorclarescork.ie/images/xatobij.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/suritejijasudofowalane.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/23056701604.pdfIn PDF document text
    • http://skupka54.ru/upload/m/wilovo.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/jexamutojir.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/81201487710.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/56094553990.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/wodigupu.pdfIn PDF document text
    • https://lesura.net/userfiles/file/78216136169.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/vuwitip.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/dizukufozadizeki.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/18806635018.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_off0000d834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD834 18896 bytes
SHA-256: fc8a1819e1816d48509c9b442c5eeed5c9458475688f1bdadc46330d91f8fea5
font_01_sfnt_off00010a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4B 10636 bytes
SHA-256: 4e6f18a48998424a136a457ca74600a35fd5c5b459c91d67c4e22744714e7e8b
font_02_sfnt_off000122b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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