Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d4fd2fbef28900…

MALICIOUS

PDF

97.0 KB Created: 2021-02-19 21:59:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0486b9d7e58b22844254193f01472315 SHA-1: 08d956c2c392214a7cff4b0c9d6ade9bd5d62235 SHA-256: 21d4fd2fbef28900f5e15f35e67ae3955a7c000b689d2e7f512187ae558ca77f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=what+is+icao+annex+2 PDF link annotation
    • http://stav-games.ru/information_security_for_beginners5ctp0.pdfIn PDF document text
    • http://shoop-fp.ru/kanto_region_japan_citiesnwd4v.pdfIn PDF document text
    • https://gojatoxemoniro.weebly.com/uploads/1/3/4/8/134894745/giteb.pdfIn PDF document text
    • http://bodyita.space/society_bylaws_format58d3z.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/969cef551ea73c2.pdfIn PDF document text
    • http://paxawujaxoda.22web.org/63602563703.pdfIn PDF document text
    • http://cozyplacefor.rest/autocad_keyboard_commands_changext7et.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384152/normal_60144c4921b98.pdfIn PDF document text
    • http://kulinarny.site/gilajalufabalemane1ohy7.pdfIn PDF document text
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/givopobaniwaj-gadadixotud-xejarosasega.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/chaos_head_english_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/54460768278.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBF 4972 bytes
SHA-256: 930f4281ae6e6da49dfabb9ea9e41827e800dfceb19d4c8232b2d1a48bd38290
font_01_sfnt_off00012fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB4 1772 bytes
SHA-256: 1dee64feb338e2cc595d88a35b766ea8b8b199e124349708576bb4cf11bee47e
font_02_sfnt_off00013867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13867 11580 bytes
SHA-256: 04a5e2473be221507a4611cbea0fd85669d563d6e7793537ccb6f05ed227a30f
font_03_sfnt_off0001600c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1600C 16480 bytes
SHA-256: 15a858e7ca58810eedca6b314cbf9fe35668ea3040246c24a6c9bd629062bc34

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