Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de3471e38741f6b…

MALICIOUS

PDF

79.3 KB Created: 2021-03-28 05:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0515abad21ff664a0f96ba24277e6bc5 SHA-1: 7e1ae68aee9dccb0e24b4b0dde8029f677f3e639 SHA-256: 0de3471e38741f6bc4ea9de17ed87057fb3c0e6e25d9cece4185110270d10a9e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of external URIs and embedded URLs. The document body, though heavily obfuscated, suggests a lure related to an 'English test for beginners'. The primary attack vector appears to be spearphishing, where the user is tricked into downloading a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cdn.sqhk.co/dubikureta/ha7zZkm/mofejixudukika.pdf In PDF document text
    • https://cdn.sqhk.co/manuguwe/bgfhe73/monkey_wrench_foo_fighters.pdfIn PDF document text
    • http://morasuxod.getenjoyment.net/brown_and_tan_long_haired_mini_dachshund.pdfIn PDF document text
    • http://fridgeservice.ru/sony_ht_rt40_featuresb01f3.pdfIn PDF document text
    • https://cdn.sqhk.co/sobekalob/Aijffge/street_racing_3d_codes.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/49023552386.pdfIn PDF document text
    • http://a1metromovers.com/zuwexumuxakart756d.pdfIn PDF document text
    • http://vodoroding.info/stephen_king_it_2017_book_cover750pn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/wb/ENAH/~3/kMuynZNWtA0/wb?keyword=pdf%20english%20test%20for%20beginnersPDF link annotation
    • https://s3.amazonaws.com/sajezife/tagetomubilosebademi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca708f8-5a71-4459-8359-44fbbbce46b5/25961488764.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/funofesuvubeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09e76608-f2d1-4c35-9f9c-5bd6c87d3134/200_common_phrasal_verbs_with_meanings_and_examples_sentences.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/bharaate_movie_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/esquizofrenia_paranoide_sintomas.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/bonspiel_draw_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/kofisufasoxavesepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/329fba22-5af4-48e8-b2ff-dc4ce8d09982/100_startup_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed926dfb-3341-4e7f-baac-3d5edd20fee6/software_project_planning_in_software_engineering_in_hindi.pdfIn PDF document text
    • http://kutoxinupuroxo.onlinewebshop.net/autodesk_inventor_2020_basics_tutorial_tutorial_books.pdfIn PDF document text
    • http://sofibimibojas.myartsonline.com/56265180505.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/yamaha_mg16xu_driver_for_windows_10_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0318f5b2-4d9f-4528-bc68-b4cb36e54ae4/what_is_the_latitudinal_value_of_the_tropic_of_cancer_and_tropic_of_capricorn.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/zizunofuvu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF723 5100 bytes
SHA-256: 0fb114c683fe783048e1dc00eb6cd39b3713784980f72867f3833bb3b3bf4027
font_01_sfnt_off00010878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10878 11128 bytes
SHA-256: a65661e8fb909a8e314af53ae2c005078e3dc2b68fa03ecaeffa7aebbfa2503e

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