Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2ab488d3000497…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 00:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10720598064a34931ce8ebccc0815d5e SHA-1: 1804290d45ff70af05d0050e7a643e8e43eae2c8 SHA-256: fc2ab488d3000497f22c42218e24237ada337637f278a2d44413180851132d62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting it functions as a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a strategy to distribute links across disposable hosting. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links strongly suggest it is used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cutskytools.com/d/files/32993493184.pdf
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/gubutosijadeloki.pdf
    • http://savalis.ru/userfiles/file/luzapabozosagaw.pdf
    • http://khocabien.com/uploads/files/nejig.pdf
    • http://www.logomarcanet.com/userfiles/file/rezuxukofekomijenafufukal.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130c7ce164ff---87690024259.pdf
    • http://benetworkingpro.com/ckfinder/userfiles/files/komupa.pdf
    • http://sm.ac.th/ckfinder/userfiles/files/16297172760.pdf
    • https://weilaimachinery.com/userfiles/files/61253992725.pdf
    • https://nk-sostanj.si/files/file/97403803541.pdf
    • http://pnktools-th.org/ckfinder/userfiles/files/2329241939.pdf
    • http://mcap.cz/images/uploadedimages/file/29119255058.pdf
    • https://goldmenu.com/userfiles/file/86454280954.pdf
    • http://qhchemicalsfeed.com/upload/files/31043211185.pdf
    • http://harasim.cz/uploaded/files/81991780126.pdf
    • https://dangeloremodeling.com/nbloom/fckuploads/file/16877926342.pdf
    • http://intertexmedical.com/userfiles/files/birazuporovipajunus.pdf
    • http://nessium.net/userfiles/file/nazulusosezoxujukogotevuz.pdf
    • https://mr-alian.com/upload/ckfinder/files/97850350345.pdf
    • https://bhsbeacon.com/FCKeditor/file/29942782382.pdf
    • https://kalimati.in/userfiles/file/6287060973.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=watch+the+senate+live
    • 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_off0000d4ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 16792 bytes
font_01_sfnt_off0000ecbe.bin
752e375275666f57020d7a2aacb879bd2c40fa5cedf6bb55a52883698cb1c3ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECBE 17252 bytes
font_02_sfnt_off0001197f.bin
d295cd5a2e2e8470d70a7a59ef55ae907c6bb3996522e26aa387443f54ad3526		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1197F 10164 bytes

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