Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb5c6c814fcf5cf…

MALICIOUS

PDF

72.7 KB Created: 2021-09-22 09:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0ee4ed4765b180b9bcd77ef45069df6 SHA-1: 618b070fc4d8e959bf06553737702ea199138489 SHA-256: 9fb5c6c814fcf5cf259b85828a2575a1200ac9cedb79c731bb4e1a46b3e32d1b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URIs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://huntic.ru/uplcv?utm_term=pokemon+ultra+sun+gba+download
    • http://open.ua/uploads/ckeditor/files/tesomizulejozuv.pdf
    • https://rjpexport.com/files/72914585513.pdf
    • http://forepic.com/_UploadFile/Images/file/42187675060.pdf
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/domoze.pdf
    • https://dreptultau.hotnews.md/upload/userfiles/files/84127191825.pdf
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/fiwenijewaguvufezikilep.pdf
    • http://canshu.dlzj.net/upload/files/20210917164658674569.pdf
    • http://masterref.ru/editorfiles/file/mewav.pdf
    • https://canoe.ro/Extras/ckfinder/userfiles/files/nuzipuzaxipuvoze.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6e008bb30---26900958456.pdf
    • https://thietbixanh.net/uploads/files/tevivedojawato.pdf
    • https://gkia.org/kingkong/userfiles/files/55265588623.pdf
    • http://niengrangchuyensau.com/upload/contentFile/file/71067802343.pdf
    • https://pepinieramontana.ro/ckfinder/userfiles/files/pigivufemaxijuxo.pdf
    • http://benevolo.it/userfiles/files/37876721072.pdf
    • http://bwemfjhjk.friend-match.com/upload/files/ronedukifudiwuf.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eca1f86746---xejus.pdf
    • http://bulk-supplies.com/userfiles/files/zozotuwisadonenemajij.pdf
    • http://mishelik.ru/userfiles/file/nasagozetibokabo.pdf
    • http://futurepoolandspa.com/ckfinder/userfiles/files/58628926741.pdf
    • http://deleersnijder-bocaege.be/images/file/2775803539.pdf
    • https://trouver-une-ssii.com/img/pics/files/99505788227.pdf
    • http://houtackers.nl/userfiles/file/dazatizemur.pdf
    • 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_off0000b550.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB550 16792 bytes
font_01_sfnt_off0000cd67.bin
1096de9833d3abbe1e32b8ef7870542c23450b38f328ad8f3535e085c01a0321		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD67 10920 bytes
font_02_sfnt_off0000e696.bin
b7b256d8bb037ea3d428c56e704f89bd7fade3149eafcc4bcb02a0f2a9835d11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE696 17704 bytes

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