Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36f273067f04d3c…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 01:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b07b6c4547e9db358efc27a784807f4d SHA-1: dcea863028433ac89ee1162799cb59e4c347dd38 SHA-256: e36f273067f04d3cd1a27ef92c075e194acbe510590ed3773c70fb9d7b37d276
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely used as a lure in a spearphishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/tujetemomifumi.pdf In PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/bibuwajovof.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/zolominekosoxo.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/ruletagov.pdfIn PDF document text
    • http://12shio5.com/contents/files/sedet.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/tujasuxarurudovowuduvowad.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/nijabozufevovujapepivumi.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/38570250128.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b55c459124---gumiwoxujagoforiwuna.pdfIn PDF document text
    • https://birotex.rs/images/files/jajak.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/gagilinikexib.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/zuxotabenuwirotejuwof.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/5540578656.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0902/edce3aed96169e0f570d4da7af3f0337.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/96996423711.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/rabibuzati.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210904143309.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ef60ef8273a06984ece7b91d370e0d6b/62142603499.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/dutivixukanodemim.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/66166284837.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/piwovizidojebunal.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/gaxowirimuzoxokanakuviwuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=juice+music+mp4PDF link annotation
    • 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_off0000d9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D8 17424 bytes
SHA-256: 24dff221e81d51f5a84ba1bcabef8ffbfa3c36a0698f67195607fad4e6bc1ef2
font_01_sfnt_off000107a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBF 10072 bytes
SHA-256: 3344c46b1d7afb4b442155e657fdf80c48e331e9f8ab8f7fc636ff13e457d517