Malicious PDF — malware analysis report

Static analysis result for SHA-256 941a2aad33c64e56…

MALICIOUS

PDF

83.5 KB Created: 2021-04-05 20:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c0c0a865fcfb337df6bc3629b888bd99 SHA-1: 03cd98a7264bb6e15533da45158478d3002b4add SHA-256: 941a2aad33c64e56b95426d3cec6d00eaf02c561f46059dd5f32bed8241c6e71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file is identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains a large number of external links. The document body, though heavily obfuscated, suggests a lure related to 'pregnancy announcement templates'. The presence of numerous external PDF links, including one pointing to a potentially malicious domain, indicates a link farm or distribution mechanism for further malicious content. No scripts were extracted, but the PDF structure and link farm heuristic suggest an attempt to exploit search engine optimization or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/123?utm_term=pregnancy+announcement+templates+free PDF link annotation
    • http://mokemowowove.mygamesonline.org/tebavuxodowezik.pdfIn PDF document text
    • http://girepodemaz.getenjoyment.net/44124155246.pdfIn PDF document text
    • http://sevibifodome.getenjoyment.net/lifes_greatest_miracle_summary.pdfIn PDF document text
    • http://basumoxivor.sportsontheweb.net/merigewavususum.pdfIn PDF document text
    • http://dororuminaxa.mywebcommunity.org/wordly_wise_book_8_test.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gitipezusev.rf.gd/binary_number_system_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/83555352496.pdfIn PDF document text
    • http://lanakupi.epizy.com/behringer_bcf2000_manual_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/elora_gorge_cinema_guide.pdfIn PDF document text
    • http://pesafitibum.epizy.com/chinnamma_chilakkamma_meenaxi_song.pdfIn PDF document text
    • http://dakafatuvuguviz.atwebpages.com/pelufodes.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/python_for_machine_learning_tutorial.pdfIn PDF document text
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_cbb28edd55274b31ab94fed25af01b81.pdf?index=trueIn PDF document text
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_9ba1c33e8efd4bc395bf5aa83a9f30a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/wavelet_transform_applications_in_power_systems.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/best_android_projects_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/puvadijosadowusesodoraxog.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/boraxofiturevi.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 5272 bytes
SHA-256: b89f6891b9daa70233b048a6f325e28a0e31ef1f3db4246c605e58f0cb25b158
font_01_sfnt_off0001080e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080E 12024 bytes
SHA-256: b87cdea7cdda2393b3ad408d043287f41d362455d82df4eed771c527ed5509a9
font_02_sfnt_off00013084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13084 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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