Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52df1e6aefd43c8…

MALICIOUS

PDF

80.3 KB Created: 2021-09-23 09:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd602da8dead063031fd087bf00bdb06 SHA-1: 739470f094bfadae6740f3faa0cec53100223acf SHA-256: d52df1e6aefd43c892584db4c033f59b9468e1489bea8e4450f4282dfd080407
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs hosted on disposable domains, indicating a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading a second-stage payload. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://charming-dc.com/uploads/files/202109230005335900.pdf
    • http://markone-tools.com/upload/files/nobanefetowotazi.pdf
    • http://vlajkylevne.cz/UserFiles/File/pimabagatop.pdf
    • http://ambulatorioveterinariocigliano.com/userfiles/files/dixojo.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131c9995eb9d---17656580560.pdf
    • http://alexdisinfestazioni.com/userfiles/files/gatakazuveladu.pdf
    • http://prvugkh.ru/uploads/files/31960596724.pdf
    • https://daulte.com/ckfinder/userfiles/files/49435817148.pdf
    • http://djapm.com/userfiles/file/palusox.pdf
    • https://nilsahost.com/calisma2/files/uploads/mozevagiwonijav.pdf
    • http://wangguanhardware.com/userfiles/file/44047382168.pdf
    • https://sanghvicranes.com/staging/media/redukusigosatu.pdf
    • http://ekouklid.eu/UserFiles/file/zojunenusupogem.pdf
    • https://oreopay57.com/ckfinder/userfiles/files/3540853532.pdf
    • https://studiecarriere.it/uploads/file/58150206653.pdf
    • http://olympicburger1988.com/uploads/files/ragugivusaje.pdf
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/30073473740.pdf
    • http://eros-arena.com/eros/userfiles/file/18207893956.pdf
    • http://artpolinakuzina.ru/pict/file/wupupibalununotunoguzubin.pdf
    • http://technimexvn.com/images/ckeditor/files/58698772302.pdf
    • http://cnokorea.com/userfiles/file/modadi.pdf
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/niran.pdf
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/85200265813.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=japandroids+house+that+heaven+built
    • 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_off0000d517.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD517 16792 bytes
font_01_sfnt_off0000ed2e.bin
452b8f65480fffd3af39ae5619b3b0769fb7a87ad61d7e7564178b9525345148		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 10788 bytes
font_02_sfnt_off000105b5.bin
ea65829280d4bd072c3fa3e4153513ccce26c6fb96464e551b84cd8722ebc7ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105B5 17496 bytes

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