Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b321ab6bd13eac…

MALICIOUS

PDF

71.0 KB Created: 2021-09-29 10:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f2f6ed5a2c2da95ab2ff0f4c21d43506 SHA-1: 62eade3d48287169d61bfc7dcfba12a924d0c82b SHA-256: f5b321ab6bd13eac4d857931346b6ad5b52211b339fecbf862ef6127ed56c385
126 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 numerous external URLs, many of which are part of a link farm, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=sleep+monitor+full+apk PDF link annotation
    • http://mvpbuilding.com/userfiles/file/99966821385.pdfIn PDF document text
    • http://runo34.ru/attachments/file/45100005378.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///19443855519.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/13133087032.pdfIn PDF document text
    • https://mashura.co/userfiles/files/60322194373.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/dizusupamuzow.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/nefifumejinutorawe.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/57481365844.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/kogijovapino.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/51023703464.pdfIn PDF document text
    • http://erictex.com/ufiles/files/nugil.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/vuragubepolajovok.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/nupirejanedipix.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/10682864907.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/najuzoseladofibarasul.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/87856739153.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/2668657419.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/wevosivibi.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/lelezetimegexuka.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/28184407656.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/xovoreribel.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/81822859457.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/metimaxunezogar.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/rubak.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/kafitimoje.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_off0000b24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24D 16676 bytes
SHA-256: b729917ec024f67c457ef49821db03cbdc4b34ec17716434282f69e384232a85
font_01_sfnt_off0000dc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3C 10620 bytes
SHA-256: d5d7226c09af27b1fc5a5b81fa3f3cd016c3ec6e2ca7a85c235c76c35f72e146
font_02_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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