Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2786d7e5aacdf8c…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 08:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07b351a02a575fac6dbf2cb984782d1c SHA-1: c7c7100c4c0f5b3a158719f202860da030f10fe6 SHA-256: a2786d7e5aacdf8c1755b11fa0576738732a755420bc221d96eaf592238be440
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=download+injustice+god+among+us+mod+apk
    • http://emachn.com/data/attachment/file/lorulafevojakem.pdf
    • http://artpolinakuzina.ru/pict/file/34501120535.pdf
    • https://onsale.social-push.cc/data/fckeditor/files/mobit.pdf
    • https://mayphoviet.com/media/ftp/file/66045221426.pdf
    • https://taptigrihnirman.com/singhania/downloads/file/vemixa.pdf
    • https://kaktutzhit.by/uploads/files/63058537526.pdf
    • https://expobar.vn/app/webroot/files/images/pages/files/dufoxomoburajik.pdf
    • http://workontext.ru/media/file/85950579534.pdf
    • https://evergreencans.com/userfiles/file/63762785044.pdf
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/lafukasikidikawi.pdf
    • https://houstoncoinshow.org/FCKeditor/file/33798334214.pdf
    • https://oteaexpert.fr/cite_imgs/file/78165910272.pdf
    • http://bebaldebaran.eu/userfiles/files/sewufofosejuzamoga.pdf
    • https://bloomlight.pl/_bloom/file/41837635603.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/darimutikozuvepozedog.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/4d4mu5nr1ttq11g9crtjsht73d/80783239672.pdf
    • http://hidramaco.com/files/files/wudotizokupufogobaletid.pdf
    • https://www.milestonesmn.org/ckfinder/userfiles/files/wulovosedopuf.pdf
    • http://moje-stranky.eu/userfiles/file/79811894902.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144eb21b6b6c---bugatufilakurusaraf.pdf
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/67993218965.pdf
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/pirujosog.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_off0000c29c.bin
0544f102ff64f82b76b9cf0732004b17ed6752b993a7a1cd3a42c1e9d44cc1e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC29C 16144 bytes
font_01_sfnt_off0000ec18.bin
a573b676e333c1d3a6a75cdc29b2844afca98cb0683ea27443bfc55400865634		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 11168 bytes
font_02_sfnt_off000105ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105FF 16792 bytes

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