Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e1d8888a3cbee53…

MALICIOUS

PDF

76.4 KB Created: 2021-09-23 21:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a95df7ef7473b5bbebc2cec5aaa4056b SHA-1: d2f9c86c461878a58f708e1af7081d74bd825c4a SHA-256: 9e1d8888a3cbee53e0125498c9d283839d62e32dcceb624b4ce617bbd167d41b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the phishing lure by indicating a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=big+r+words PDF link annotation
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/451c1df96dd61d0acca1beb26d55c688/dagikamalore.pdfIn PDF document text
    • http://le383.com/uploads/files/gifoban.pdfIn PDF document text
    • http://eksternest.be/images/file/5056233337.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/23941242844.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/41770446317.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/lukemovasu.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/bigidavexonezotivukojaf.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/kidiromoduxodamivijo.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/meluworofoxewedutirojafa.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/68616571826.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/95297193738.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/liteloxosibumexeluxuzeto.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/20/rulebinuzovidoja.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-16-17-56-36-71.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/67949785195.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/nadovusude.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/xosutisebofawuvupuwepifi.pdfIn PDF document text
    • http://boldogelet.hu/media/6693635852.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/peluvufuxuved.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/50625639861.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/bumopu.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/39068217891.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/releserudogefuzisusa.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/17954082218.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1B 10020 bytes
SHA-256: e0fa26a7f82c10b57ca1af402375e1cce2feb5f8df12d95899001f5f0ad94929
font_01_sfnt_off0000e146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 16608 bytes
SHA-256: 099fe1d1936d12a1a13420804ca3d34fddd8d45d7d126e3b040d51c0d848b3d4

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