Malicious PDF — malware analysis report

Static analysis result for SHA-256 198dd15057d6a56a…

MALICIOUS

PDF

86.9 KB Created: 2021-09-16 18:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58c57b08eefed577301732949a4070d7 SHA-1: abd6ea034e619ff9908620a4a147e48a25c19b75 SHA-256: 198dd15057d6a56a28e1fac5fe209a59baf1139d12c796af7b5d0aa93763c5ac
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external links, many of which are hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=android+update+for+redmi+note+4
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e93e2c1f7---kuzuxakefujinotigaxan.pdf
    • https://mkontakt.com/dat/file/99863637950.pdf
    • http://chayka-svg.ru/files/nofadowebijobonixuvavopo.pdf
    • http://wabasnb.com/files/fckeditor/file/15555208176135fcd4a827d.pdf
    • http://otpetye.com/images/shared/file/26475409322.pdf
    • http://eegbiofeedback-leszno.pl/userfiles/file/99243447454.pdf
    • http://orderbestwings.com/uploads/files/5831661783.pdf
    • https://tainandentist.com/uploads/files/202109090749008663.pdf
    • http://pallenberg-busreisen.de/uploads/files/woxaverotiwafobetepidima.pdf
    • https://www.tunnel.de/files/uploaded/file/duminafogipanuwoxofonov.pdf
    • https://247christianity.org/fckeditor/userfiles/file/483101928961631712135.pdf
    • https://vwb.mrv-educationservices.com/content_file/files/90168747494.pdf
    • https://laatjehuisweerstralen.nl/upload/file/58848099658.pdf
    • https://melz-feu.ru/upload/58318568466.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131707dd19b2---94863312196.pdf
    • http://tlumacz-lipno.pl/pdrzewiecki/files/woxujesiwizogutozaz.pdf
    • https://samsungdvm.net/upload/ckfinder/files/63904726902.pdf
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/3313820105.pdf
    • http://adhdesign.de/userContent/files/20210907215826-tukutij.pdf
    • http://technoauto.jp/js/upload/files/tepot.pdf
    • http://hcbarrett.com/user_area/file/gepexajunifuwevif.pdf
    • http://roomyab.ir/basefile/roomyabir/files/50177915207.pdf
    • http://ssanadia.in/userfiles/file/8547550473.pdf
    • 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_off0000e60f.bin
8f91d0e8e347c12c53e7ba267d98a43a85221630e0447301f2581396efb2a7e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60F 10604 bytes
font_01_sfnt_off0000fe4d.bin
6044b62a40116597bc2758f4a6cca3f8af53a63744678c0c6097fcb9e2070a2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4D 20816 bytes
font_02_sfnt_off0001361b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1361B 16792 bytes

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