Malicious PDF — malware analysis report

Static analysis result for SHA-256 f259c5737ee32be5…

MALICIOUS

PDF

73.7 KB Created: 2021-09-15 11:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5df38e1e3972ab1bb4161f9c8cc51fbc SHA-1: 5ea8073187065d233b5b87535e4150a7c734b0ca SHA-256: f259c5737ee32be53e6ffe6c7398b6ef20345203b3a876e1349ce153d82fb7f9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute actions upon opening. The ML classifier and ClamAV detection strongly indicate malicious intent. The sample also contains numerous external URIs, many of which point to disposable domains and are likely part of a link farm, suggesting a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://allytemp.ru/uplcv?utm_term=bubble+shooter+cat PDF link annotation
    • http://axi-hohenstein.de/userfiles/file/47854271540.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/gomikujolaxokumonuwikat.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/42311540827.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/ravatekujezik.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/zofix.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-10/20210910165548287619.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/lelajelepolaxas.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/48280195550.pdfIn PDF document text
    • https://intersat.lv/files/file/kubijede.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/sesiti.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/52960931071.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/xotufeveramapumilurebij.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/sifuxovumefusivoruxuwowo.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/difodoxigikusedezo.pdfIn PDF document text
    • http://soles2walk.com/data/file/batile.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/luzitufipavofukigelijap.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/60395486785.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/93421346433.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/juvuzafowimulifis.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/9890591c4ce7ea62a5f079069f78cd14/12909476953.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/xagapixubalaxegix.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_off0000bd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD78 10424 bytes
SHA-256: b324c82820e6b176404fee82dc99e4a768c8fff683d2b906794393bb294990eb
font_01_sfnt_off0000d559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 17140 bytes
SHA-256: f5f6bbb22b27f32b1af951c337f079ea9e6bc7e546e8aa46351f89caf4c73666

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