Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4d6f04732db782…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 18:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e57ae9cc1b78f544c042617f2b0ac2e2 SHA-1: e742e92d5bd87f53414ee2dc15e7e75f7c521d24 SHA-256: 4a4d6f04732db7825c9ea60000047076decc5c155a487e8dd277e1629a60927c
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external PDF files hosted on various domains. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt, likely leveraging the document as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://good163.cn/Uploadfiles/files/totopiwifilonu.pdf
    • https://chuyennhakienvangvn.net/upload/files/82195316322.pdf
    • http://hytechplus.com/userfiles/file/95304192630.pdf
    • https://ntiverification.com/userfiles/file/dujetimeruxavukowomatonem.pdf
    • http://cartopack.be/Images/file/dotofolox.pdf
    • https://portalkucharski.pl/app/webroot/media/files/sodezimerugazipumalesoso.pdf
    • http://ddaengshop.com/ckupload/files/35797831310.pdf
    • https://otterdisplay.com/userfiles/file/budafumejiraxu.pdf
    • http://vpsystem.com/files/fck/94673962098.pdf
    • https://dakhoathienhoa.net/images/files/beruda.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f60cd30237---risiritalogimolige.pdf
    • https://hoanghaie.com/Images_upload/files/68465425353.pdf
    • http://bright-mineral.com/uploadfile/file/2021090716584543.pdf
    • https://equalitas.es/userfiles/file/noralufabiwa.pdf
    • http://matchonusa.com/uploads/files/78800946834.pdf
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/jisekane.pdf
    • http://mitroc.com/userfiles/file/2668657419.pdf
    • https://tadimtursu.com/image/files/guwazutajufivutaro.pdf
    • http://gpsputhuppally.com/userfiles/file/sivar.pdf
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/34921129692.pdf
    • https://prestinireedcorp.com/userfiles/files/95905376189.pdf
    • https://akproauto.com/nbloom/fckuploads/file/8746935601.pdf
    • http://gyarmatilovastorna.hu/userfiles/file/21315358184.pdf
    • http://3wsystems.com/shipinc/userfiles/files/kasowowevam.pdf
    • http://machulski.com/public/file/fofetugotuget.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=nerves+in+right+arm
    • 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_off0000e3ca.bin
4e7e3f6396bfcac3e9609511342d08631fe26756c2a5255a27559137806c207c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CA 16956 bytes
font_01_sfnt_off00010f90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F90 16792 bytes
font_02_sfnt_off000127a7.bin
ace533dc24e4e0df6874c9562c3fc60e28ae855b5203caf47428a184a10e510e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127A7 10432 bytes

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