Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b2a31a0296e679…

MALICIOUS

PDF

73.7 KB Created: 2021-09-23 21:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 89d5291cf00f18018a5f47814537cde9 SHA-1: bcef9e5a0f81ac9920357a6418d5e35d4b66d761 SHA-256: 40b2a31a0296e67938bc858b1937357b19ea1b6cb4b8977f16b1dad5c76243f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc59fe2073---98866004049.pdf In PDF document text
    • http://adbrf.com/files/fckeditor/file/84575331061323b48784a7.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/73998223290.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/munoxebesavu.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/nugidato.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/mitaduzakosu.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210916/1826041303.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/89cc84df8ac19d68004823db102a6f36/63778221919.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/jezugokufunuwiredetoga.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/lubisova.pdfIn PDF document text
    • http://fkhd.cz/data/img/jesibenofezoduwejir.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/89296995381.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/dapufu.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/gapiwowafufilorinitu.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/jaraxixep.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/41529763645.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/97105974186.pdfIn PDF document text
    • https://kopari.hu/files/file/nowerejiximozato.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/toruzakosigivumemiw.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/85353366676.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/daregekuzaxa.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/mupabizo.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/romifomakesimuv.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/gisolosavuzizakuwiwekugut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=filmorago+apk+2020PDF 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_off0000c171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC171 15956 bytes
SHA-256: b5764c40ba78f1b701f2f28d91a565e3d6b41ee7ece1a1827fbc04452f47d51f
font_01_sfnt_off0000ea1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10234 10404 bytes
SHA-256: c16aa92613f17eaa854aaf1af512a79bfffcdb9c40d8eee37595585cf763f399

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