Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cce31735fc9ead8…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 14:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e948403edf193c78326bd3f0df787e7d SHA-1: 093967e45cbf837f6bfdf1959745e536a7fe6d36 SHA-256: 5cce31735fc9ead8e564a0089f38b81a8fafb70e884b6167f3700f5faecde0d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct hosts. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.hkrns.org.hk/ckfinder/userfiles/files/rizikixusamume.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416fcf1174c---wanuze.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-9-6/20210906015759388920.pdf
    • https://guineaservicesproviders.com/gsp/files/lufejap.pdf
    • https://kingbakerypans.com/userfiles/file/97900649759.pdf
    • https://ermolino.mebel18.com/uploads/files/vasulomupujitowobevinaruf.pdf
    • http://pamatudarbai.lt/ckfinder/userfiles/files/13256505449.pdf
    • http://clerus.hu/files/file/74678092198.pdf
    • http://gsprojekt.eu/userfiles/files/99983969979.pdf
    • http://benthanhsgfarm.com/images/uploads/files/gebarebo.pdf
    • http://yeosingol.com/FileData/ckfinder/files/20210917_07EB988DA9623669.pdf
    • http://alacartedesign.de/userfiles/file/398834399.pdf
    • http://deeringbayrealestate.com/userfiles/files/wusaluvovaf.pdf
    • http://metallpress.info/files/96485870124.pdf
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/lilebisosifoxaguwijuderu.pdf
    • http://keemunblacktea.cn/uploads/file/041936027920.pdf
    • http://chapelguild.com/images/usr/96154524389.pdf
    • http://ukwoodrecycling.com/userfiles/files/wukevewane.pdf
    • http://christschoolblr.in/userfiles/file/zovanawelifefowogonomize.pdf
    • http://ormansagszive.hu/upload/file/sesovuguvadumomorawomajis.pdf
    • http://askort.pl/Upload/file/45302732366.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/3121487343.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=mi+pad+1+custom+rom
    • 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_off0000e7a6.bin
45de66afa1887dd2a623798a358af3334326f87a910aa95fc590c4a0de4e11e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 10536 bytes
font_01_sfnt_off0000ffbc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBC 16792 bytes
font_02_sfnt_off000117ce.bin
f5904f772959d9f79a4c599f92c8c427d8bb38ad655ab8ece08bdbe0b23238e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117CE 18528 bytes

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