Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23e47c34c7fe11e…

MALICIOUS

PDF

84.4 KB Created: 2021-09-20 15:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd3044e9061114955398675c9bd9d6e1 SHA-1: 734b0c7044d9175e96147e6b584b6689ebcc1032 SHA-256: a23e47c34c7fe11ead36fd115bff626279e4bfd4a09a1b727c21c28fce8eb435
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier strongly indicates maliciousness. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 4

  • 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://catamma.ru/uplcv?utm_term=task+manager+in+android PDF link annotation
    • http://greddy.com/admin/common/ckfinder/userfiles/File/zililoloruwupop.pdfIn PDF document text
    • https://medius.sk/userfiles/file/5492370834.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/lugopileremunufevuvidis.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/nufabepumazi.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/narudo.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/vobawojedeleg.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/kulugufumawus.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/71430245389.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/35368036638.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/71595475031.pdfIn PDF document text
    • https://virker-ikke.dk/files/4123028231.pdfIn PDF document text
    • http://sb-78.ru/files/file/16465734894.pdfIn PDF document text
    • https://megashina24.ru/files/files/85923330041.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/soxepeses.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/sibupaxetupurigogejif.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/xufipelolawilitidanu.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/35332885707.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132850790bf8---sawodibitizopikiso.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/bajapenajuz.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161384ea3dfe8b---24543032479.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/16195981052.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/59980353431.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_off0000e768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE768 17536 bytes
SHA-256: c83e19496750475591e31d11478065f974a2d72b8ce428c4d05d19b4eaecd9a3
font_01_sfnt_off000114db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF2 10504 bytes
SHA-256: ab676456326a755530b5fd0a25ea5a9f04ecc09a4c2ab4fcdb257e64fd84bcc0

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