Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4adcc64342f8dce…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 22:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ba2276e01bf54073df90b4652e70471c SHA-1: f2278874f4feda907fca145cafc91a1d792329c8 SHA-256: f4adcc64342f8dce9f6ea94cec1caa01d75e54f844eea69c7a6b3cf14981d07b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links to external PDFs hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download and execute a second-stage payload. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to a technique of using link farms for obfuscation and distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://iveducentar.com/uploads/assets/file/vufonojiluzoz.pdf In PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/38525940861.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/renisajakivisuruvefekobip.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cfe3aa7ed---mojaxefedanegotibufabaje.pdfIn PDF document text
    • http://steinemann-ag.ru/zodasuzixamuzaxavunudado.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/87374488891.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/zejomevoxufu.pdfIn PDF document text
    • https://digiconelectronics.com/media/fujajoru.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210908090310.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/raxazof.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/xakefajafufufuratu.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/tozusewes.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/tikerusapivomudobavenusit.pdfIn PDF document text
    • http://idroter.org/userfiles/files/49541324424.pdfIn PDF document text
    • https://olterus.net/contents/files/fedodimewaxate.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/gosategejepufowemuvuwugib.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/88804740852.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161312e5c4c85d---vepuzadudupudow.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kimuxuwutotudekizafi.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/guwafabogex.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/92129638919.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/tijexibebetepenu.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/fajafepel.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/givunodigusawokedopub.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/74753158704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=uno+apk+modPDF link annotation
    • 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_off0000d7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 19816 bytes
SHA-256: ed924cee21b63167d294a2b9dbc7efdb9cc6b59ee1ed5978fcfbc7b88f4525b4
font_02_sfnt_off000123b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B3 10016 bytes
SHA-256: 30ce7871288132c89792f6bf322f1ecaf0bbf46a17b4ee668a1c000ef447f4de

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