Malicious PDF — malware analysis report

Static analysis result for SHA-256 81919030b1ef177f…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 12:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94692208e7b42c5d188d9dc03770b5cf SHA-1: 4cf7d27570233b93cbee624f7ce34342bf691189 SHA-256: 81919030b1ef177feecba40957de7dd6ed84dbfe138c0badfff2b25412089d15
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier also strongly indicates maliciousness. While no scripts were extracted, the structure and URL patterns suggest a phishing or spam campaign aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://cnmrobotics.com/files/files/23453430639.pdf
    • http://holidayservicemarsala.it/userfiles/files/13084408997.pdf
    • http://eksternest.be/images/file/40712348247.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/bb20f61c09559145df1e3dd8383e8821/64957503059.pdf
    • http://automotiveenergy.cz/userfiles/file/27130757517.pdf
    • https://bliznacite.dvsportbg.com/files/21479686208.pdf
    • http://elitacasa.it/images/file/tuzavaragakuroxu.pdf
    • http://esistore.be/userfiles/file/93736210635.pdf
    • http://hasanmasat.com/ckfinder/userfiles/files/visev.pdf
    • http://ruresept.ru/files/file/9494009673.pdf
    • http://emirates-offshore.com/uploads/image/file/31281066872.pdf
    • http://i-akparat.kz/ckfinder/userfiles/files/vativupaki.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/9gj268iojhps0djlkacobekosh/tovelivezamamure.pdf
    • http://asavn.vn/uploads/userfiles/files/rumeruziviruluxexogofa.pdf
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/297fe1e2a1a2ed87851bb7bc8ac1c2f2.pdf
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/rejuriwajodovatab.pdf
    • https://alakharia.com/public_html/userfiles/file/64003816871.pdf
    • http://airmon.hu/images/files/sebuga.pdf
    • http://myoffice2561.sesao33.net/UserFiles/File/bivakap.pdf
    • https://repetitorebi.ge/userfiles/files/jekekaxotavin.pdf
    • http://anticacarsulaeborzoi.eu/userfiles/files/40936624677.pdf
    • http://mathcountsoutreach.org/userfiles/file/toziduretasidixe.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/3195557416.pdf
    • http://rpsbchamber.org/editorData/file/lifekukon.pdf
    • http://thaymanhinhlaptop.com/userfiles/file/38009403258.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=samsung+galaxy+smartphone+price+in+bd
    • 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_off0000b01e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB01E 16792 bytes
font_01_sfnt_off0000c830.bin
15d783b95b57e31d4575e9a65a709ec41db104ee9b73971ef97f8d2d16c1b1b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC830 16244 bytes
font_02_sfnt_off0000f1b4.bin
73b0638872857712001c74ac2c8c44119a3f780fa7c852d63680c9b4946837ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 11492 bytes

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