Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8dfeaf87dfb0a8…

MALICIOUS

PDF

84.2 KB Created: 2021-09-11 11:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71a0ec5761246ea884be7cf452c7b7f6 SHA-1: baace9fb9577ff86d49a902f40eb76f9a8edd63c SHA-256: 4f8dfeaf87dfb0a8b3f2b3ef55c1e5febcdbd7392f6042f0b20d4ed1b093ab03
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, with one pointing to 'garglob.ru' and another to a link farm hosted on 'mgrenginiai.lt'. The PDF structure and the presence of JavaScript suggest it's designed to exploit vulnerabilities or lure users to malicious sites, likely as a phishing or malware delivery mechanism.

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://garglob.ru/uplcv?utm_term=real+car+parking+2+mod+apk+latest+version
    • https://mgrenginiai.lt/ckfinder/userfiles/files/87611932571.pdf
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210911110622452737immji8.pdf
    • http://www.ondebiz.com/userfiles/file/69916895458.pdf
    • https://mi-stores.com/basketballtotaal/images/editor/file/99239951031.pdf
    • http://playbabydoll.com/userfiles/file/dijovevijas.pdf
    • http://kimwendelldesign.com/ckfinder/userfiles/files/49959253305.pdf
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/putisenedirerepitaxoj.pdf
    • http://net-marketing.hu/images/files/47539857097.pdf
    • http://wjvanderheidedienstverlening.nl/uploads/file/36465698278.pdf
    • http://expresskaliski.info/file/41817115611.pdf
    • http://gd-weimi.com/upfolder/e/files/20210904115924.pdf
    • https://hatinhjobs.com/upload/files/mudogejabasadar.pdf
    • https://shipnhanh247.vn/asset/files/lexigugigejezixawixemotod.pdf
    • https://pasarangroup2.com/contents/files/99697508769.pdf
    • https://inverpalmas.com/aym_image/files/kedawuwopixe.pdf
    • http://dep14kirov.ru/userfiles/file/70305192574.pdf
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/betosapulobok.pdf
    • http://www.aragonemprendedor.com/userfiles/files/45389232269.pdf
    • http://purepassion.pl/userfiles/file/45706332463.pdf
    • http://plusk-car.com/js/upload/files/86747735277.pdf
    • https://jackinthegymtpe.com/uploads/files/202109031948495145.pdf
    • http://nieruchomosciklodzko.pl/files/file/jefinuwirasoj.pdf
    • http://rspon.pl/images/wyswig_images/file/66723643836.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_off0000e17d.bin
c458191721940d3c2981479a96244e970495931f161784d34a649af18c2aed43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE17D 18256 bytes
font_01_sfnt_off00011098.bin
ca44eb5cd000ff65ba41a80871595770f01345b9c6868c6bd60e3a5efca33bc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11098 11180 bytes
font_02_sfnt_off00012a97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A97 16792 bytes

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