Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5dab56ab1f538a5…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 05:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7f5f04414322bee1136b3b3851edef3c SHA-1: 4fbe4f130d04ffc13ad879b0a10e83fe39b0d9bd SHA-256: a5dab56ab1f538a56896381dbb8d98457398a596dad6676ecd2b034fddf0e696
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to a suspicious PDF file on a potentially disposable domain, suggesting a link farm or redirection tactic. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to lead users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://theorientgarden.iorderfoods.com/uploads/files/tijezaluzufijulopodet.pdf In PDF document text
    • http://e-cluny.cz/UserFiles/file/43223427378.pdfIn PDF document text
    • http://workontext.ru/media/file/76723159191.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/liwuwibige.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/91793587540.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/71277439664.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/debudumovi.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109012348428822.pdfIn PDF document text
    • https://network-italia.it/file/40397825008.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/69263995503.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331d9fd5b78---23731566015.pdfIn PDF document text
    • http://happy-land.hu/editor_up/pumog.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/87613621015.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/27256777887.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/73161287747.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/99134704264.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613944766942a---45598774146.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/46156169823.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1630708941f68031e958c443c0dfe.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/29289880055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=life+after+death+by+deepak+chopra+pdf+free+downloadPDF 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_off0000d02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 10940 bytes
SHA-256: 91cbd972bdf5c5e9bae52f87d9bb519e0747df23c244650ecde37ec61fcfd20b
font_02_sfnt_off0001015e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015E 18840 bytes
SHA-256: e0a36559b927a6c02557ffbbc92f71ff42aba00e81cc90fa05ad96fe69663699

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