Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a7b38d7867a345…

MALICIOUS

PDF

72.9 KB Created: 2021-03-24 22:20:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 80d5a765ce3d7de04f0786130077a9b4 SHA-1: 1f7bb133a112894fa0e8b143de828f888f403157 SHA-256: a0a7b38d7867a34579355fa1eddb6f7ff76bd77d759a81cd59f6ad96c936b926
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'nipisod.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to a 'coordinate plane grid PDF'. No scripts were extracted, but the presence of external URIs and the overall malicious verdict strongly suggest an attempt to redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=coordinate+plane+grid+pdf PDF link annotation
    • http://detonicinitalia.website/summer_waves_elite_pool_filter_a_c7vjyr.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/95135962023.pdfIn PDF document text
    • http://vijepuwobewi.mygamesonline.org/54208486170.pdfIn PDF document text
    • http://x-bionic.shop/80812274663bfjle.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/13649248600.pdfIn PDF document text
    • http://fonivoguko.medianewsonline.com/72863970605.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dinilederu/nikon_d5100_brand_new_price_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/bluestone_alley_piano_sheet_music_with_letters.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/biomechanics_in_sport.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9950949c-4e5b-48b4-a356-12126063edc5/dsl_2750u_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc953dc4-ae3d-4610-a4fb-6aed65b4fc16/40979957805.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/how_to_transfer_mini_dv_tapes_to_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/zibuzujowareke.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/66985583841.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/70304017986.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/vigirokenofewato.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/jusabovamuv.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/husqvarna_450_chainsaw_service_manual.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_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 4936 bytes
SHA-256: 8c684258a9051e3bdf3f1d901af66befc1e645caa3fb7b83e867324f8bfcf44b
font_01_sfnt_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 10832 bytes
SHA-256: bc7c69dd6d6cf90c32284dc664970c618376b1bc728bb2ead231b6a589e2e68a

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