Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd50142967543c0…

MALICIOUS

PDF

100.7 KB Created: 2021-09-11 20:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d10755eee8514783637f8898515080a9 SHA-1: 45767c105d7d482ee3e092b04f94bcd13571ee5f SHA-256: 0bd50142967543c0fa089495931361f43b8f3061b4a733be51dae64df4b9407d
186 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with a critical heuristic indicating a browser extension/update installation lure. This suggests a social engineering tactic to prompt the user to download and install potentially malicious software. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://zaindu.drogomedia.com/files/galeria/files/74610439346.pdf
    • http://knauto.com/upload/file///37199362243.pdf
    • https://polandpools.com/contents/files/getirafalobe.pdf
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/17160108526.pdf
    • http://cambridgekapurthala.com/damana/userfiles/file/82049347522.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/2725504523.pdf
    • https://djecijagarderoba.me/userfiles/file/60918185825.pdf
    • http://moscreen.in/cmsfiles/file/10389316582.pdf
    • https://eurouniversal.eu/ckfinder/userfiles/files/nuvosilawenefutazapen.pdf
    • http://innotack.com/userfiles/file/fawawada.pdf
    • http://pune-india.info/userfiles/file/10045467088.pdf
    • http://140.121.180.103/ckfinder/userfiles/files/79301617608.pdf
    • http://palyavalaszto.hu/teszt/upload/file/26430413905.pdf
    • http://cansuyu.org/resimler/files/xagemazajipafumun.pdf
    • https://bandotrading.it/uploads/file/nanuze.pdf
    • http://dotykbylinky.sk/_subory/subory/dogixodarokugamisi.pdf
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/57310927011.pdf
    • http://oresteruggiero.com/userfiles/files/resujubi.pdf
    • http://bige.vn/uploads/userfiles/file/jeperoveruwol.pdf
    • http://www.heksan.com.pl/file/21502578725.pdf
    • http://cafemsoffice.com/userfiles/files/15961693006.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c8b0af9db---38360213782.pdf
    • https://digbijoynath.in/uploads/userfiles/files/65580587163.pdf
    • https://ketex.com/trcgp/ckfinder/userfiles/files/57504347367.pdf
    • https://navliecky.net/userfiles/file/fujunadukosifiganilax.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=newest+version+of+android+os
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001256d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1256D 16792 bytes
font_01_sfnt_off00013d84.bin
354b3c4c57a7f193c0caa1fa28d0f992cd126925efb11fed03b83de9b47b6620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D84 10428 bytes
font_02_sfnt_off00015560.bin
a49da37ff57478923cd13bafbccf82208ebc14a0effa284b357881123427966e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15560 18380 bytes

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