Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15b1a25faa5262e…

MALICIOUS

PDF

80.3 KB Created: 2021-09-22 13:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ced4dda760297e4bafe2bb676f435ce SHA-1: a088269cf17f906f1e6fd0a2a9fa8df8c830c148 SHA-256: d15b1a25faa5262ecbb24e47730cce034f129b870ee95784a21d9f62e9257e61
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://tanriovermensucat.com/uploads/genel/files/niwawelabiku.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/kezogovalezok.pdf
    • http://asiancfea.org/userfiles/file/24202256714.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ecc64d14c1e646071131080e216bb8b/53475041525.pdf
    • http://ipublicity.cz/data/file/4274611637.pdf
    • http://astmasme.com/userData/board/file/79788956936.pdf
    • https://mimpishio1bet.net/contents/files/garujo.pdf
    • https://castel.ro/userfiles/file/wuwawutavenemoretaziv.pdf
    • http://disonde.com/filespath/files/20210907171541.pdf
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/wunoj.pdf
    • http://kaushalacademy.org/ckfinder/userfiles/files/15790494799.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/65792384569.pdf
    • https://protectname.xyz/whoisprivacy/userfiles/files/60692534179.pdf
    • https://ratco-hardware.com/Ups/files/vikefog.pdf
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/wopodukov.pdf
    • https://stancijanegrin.com/userfiles/file/40795456814.pdf
    • https://polaria.cz/images/file/59710826389.pdf
    • http://namthangbasaltstone.com/uploads/image/files/togederugivekogilidolaze.pdf
    • http://hzzxtl.com/UploadFile/file/20210919173219113.pdf
    • http://htygroup.com/upload/files/talerewi.pdf
    • http://ciaomamma.hu/editor_up/71567882087.pdf
    • http://www.andreapondika.cz/file/sosixataruvewimoviz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android+wlan+verbindung+teilen
    • 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_off0000d66a.bin
113a5f8f94abc07e9253d44dd9d0f88e2997b873e6c174d8763dd21983cd8dbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD66A 17972 bytes
font_01_sfnt_off000103a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 16792 bytes
font_02_sfnt_off00011bbe.bin
777b814a84314ee35db95255d5ca6aa200067967fd5d8d47e2f8f662511121c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBE 10628 bytes

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