Malicious PDF — malware analysis report

Static analysis result for SHA-256 3faae1ca93bde000…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 02:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1ce0fe9ba9dba9b0b02091e1b7f866c0 SHA-1: 2e9b4185eeb4f7f5adf00a2443e71bcf18cf782c SHA-256: 3faae1ca93bde00066e4b02587bdd3f6ba8090c1576a42c27ac133d4f5c48925
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting or link farms, indicating a likely attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the PDF is designed to host many outbound links. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=easy+words+with+r PDF link annotation
    • http://otestmanager.org/club/data/userfiles/file/20210901133444.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/toxexekexedi.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/211798374.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/tizegunifezilus.pdfIn PDF document text
    • https://matratva.in/userfiles/file/64844469708.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/nemisesiralenaz.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/linefeje.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/buwesegoredisaxi.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/92356234732.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/gazedubapijod.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/tabibidaz.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/bixavowovekixopobedada.pdfIn PDF document text
    • https://istanajp.com/contents/files/87671607879.pdfIn PDF document text
    • http://ergakiland.ru/files/files/satajososezizeregel.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/53909639164.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/80394566546.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210916061023.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/nopupemetimoluxokowagokex.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/remek.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/gikuja.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/5f4a5d17d4e0653176bae48219adfd58/wosutozakuza.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/genumagadazi.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/xoradupivumes.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_off0000ddaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 16816 bytes
SHA-256: 94f3b294a800b7997e3bccfb8a635fd262feefc556c301eb7ee53853efb4453f
font_02_sfnt_off0001210b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210B 10244 bytes
SHA-256: f4bf983f1c8e68d56f457577e7c7043fa97f978d83888b519aa7a58b076d996f

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