Malicious PDF — malware analysis report

Static analysis result for SHA-256 22138b70d84c0a53…

MALICIOUS

PDF

73.1 KB Created: 2021-03-31 12:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 377ebd544382e0f5f0aa2e01739c5d6b SHA-1: d5c0f47fecca79cc02fae3cbf8bc537c8437a47b SHA-256: 22138b70d84c0a533816e61f7f2423497e6e384800da16c1d130750577321ab4
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text related to sheet music, which is likely a lure. The embedded URI points to a suspicious domain, 'nipisod.ru', which is likely used for phishing or malware distribution. The PDF also contains a link farm on disposable hosting, further suggesting malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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/123?utm_term=bury+me+beneath+the+willow+sheet+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366973/normal_60623fcb175dd.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/hbRvCia/xodefelajawuwefuwokuveko.pdfIn PDF document text
    • http://vuwefedope.sportsontheweb.net/waiting_for_godot_full_play_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376600/normal_60151ce2b0ee0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370777/normal_603f25e5dd1cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420604/normal_5fffb3c1c3202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_6054db9918e24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451542/normal_5fe788dc7fc96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450034/normal_6056a6d136be8.pdfIn PDF document text
    • http://jenewazajasazu.getenjoyment.net/tudo_sobre_cancer_de_colo_de_utero.pdfIn PDF document text
    • https://cdn.sqhk.co/gotoruzud/hdKiaeE/bee_brilliant_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jeborawaleko.atwebpages.com/65350816353.pdfIn PDF document text
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_58c05d551bcf484e8720f9af3b82ec8b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8ce9a01-4e88-4833-999e-614de37315da/como_fazer_um.pdfIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_07bcc82c4cca47899531612098232d34.pdf?index=trueIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_33ffd680639f4c1ea3531601f053a8d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc1b2e30-e2e4-402d-a6df-4498b1c2228d/saeco_royal_coffee_machine_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c7dbd96-573c-4e8b-8531-6c82eb4428f3/arris_sbg6782-ac_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1f2285d-d5b8-43e0-bce4-ed2ca5a502af/64446453960.pdfIn PDF document text
    • http://rorokepu.atwebpages.com/in_christ_alone_lyrics_song_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55c2f827-12de-4d12-99ec-58463fa12fc0/72172164378.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_off0000dda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA8 5424 bytes
SHA-256: 6e4a858faebeb96de676c20960bbd03324f044cde49b76d6d0da76753c79d30c
font_01_sfnt_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 11300 bytes
SHA-256: 05987db2d7a3fbc18d5b171c8ad9524dc81073e374c98c3e85e7f08c2dee8972

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