Malicious PDF — malware analysis report

Static analysis result for SHA-256 19851997efd116ed…

MALICIOUS

PDF

75.5 KB Created: 2021-09-17 07:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff6a9459f4bee8d9f374866826d389df SHA-1: 4c6b1c4eb0d6f05caefb69a3cc3863845e168d91 SHA-256: 19851997efd116ed8cc59b49e25edf11c63e05353b21a557beee075c118876b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a distribution or phishing lure. No scripts were extracted, but the structure points towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://pieseclimaauto.com/files/file/levokoz.pdf
    • http://chipublichouse.com/ckfinder/userfiles/files/leporo.pdf
    • http://architettorobertafasola.eu/userfiles/files/nuxujokazabixusuzipuram.pdf
    • https://akonis.ch/userfiles/files/dubiz.pdf
    • http://etoprosto.ru/ckfinder/userfiles/files/77679985375.pdf
    • http://cplust.com/upload/serback/files/20210916221250.pdf
    • https://altstudio.be/app/webroot/uploads/file/34992537327.pdf
    • http://tajilin.com/upload/files/razoxesamijod.pdf
    • http://batiment-tunisie.com/userfiles/file/27142350602.pdf
    • http://vipnjl.com/userfiles/files/dokajonimakiponewore.pdf
    • http://cafesezony.ru/fck_editor_files/files/39572906625.pdf
    • https://aradovan.com/userfiles/file/deginanoranijuliji.pdf
    • https://ymy-tea.tw/upload/files/12898705491.pdf
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/leximutotojevotenepesibu.pdf
    • https://manuscripthandler.com/userfiles/file/gorew.pdf
    • http://floral-design-lindgens.de/userfiles/file/34270628509.pdf
    • https://fundoohairstyles.com/hairstyler/images/file/dumizurozapewuvafefifoxo.pdf
    • http://bielle-srl.com/userfiles/files/duwukanoponewi.pdf
    • http://first-group.kr/ckupload/files/rosiweni.pdf
    • https://machnhaduong.com/images/uploads/files/gozigobizojuvukuxinumoz.pdf
    • http://surveycook.com/upload/tmp/202109/file/sabakusowinetugikuxode.pdf
    • https://mldom.xyz/web/img/podborky/files/68904350553.pdf
    • https://408of53crownstreet.com/assets/media/files/35721129636.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=beyblade+burst+app+new+version
    • 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_off0000c205.bin
1198129d8e1858713d8bdaa43d64bbdd0d0ad655e278141df373ee1403c32266		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC205 10944 bytes
font_01_sfnt_off0000db60.bin
c0c8e3d4b51d264eb16eee47aac8bbce26e99907d1b37381ee3a8b6868cbbe29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB60 17236 bytes
font_02_sfnt_off000107f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107F3 16792 bytes

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