Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbcb698cfb38c759…

MALICIOUS

PDF

86.8 KB Created: 2021-04-05 20:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06abbfcf6a84a9fe59e416f281f133cf SHA-1: 58081b2515cd25a7bcdb5a6c6f47eb308a95138d SHA-256: fbcb698cfb38c759679927474e0d4720b451965138666e63ee0721490b79b796
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to benign-looking PDFs, suggesting a link farm or SEO manipulation tactic. One of the primary external links, 'https://resalured.ru/award?keyword=methylmalonic+acidemia+pdf', is suspicious and likely part of the malicious infrastructure. No scripts were extracted, but the PDF structure itself facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/award?keyword=methylmalonic+acidemia+pdf
    • http://copyright-securityx.com/esl_activity_worksheets_phonicsnt59d.pdf
    • https://felomavemupej.weebly.com/uploads/1/3/4/5/134583365/faduzagobab.pdf
    • http://lnstagramcopyrightservices.org/lixipumarizajutotukunez0nh6m.pdf
    • http://afracheat7.xyz/milumijobhp0gg.pdf
    • https://tefajakitom.weebly.com/uploads/1/3/1/3/131378990/5435865.pdf
    • https://tokegomobox.weebly.com/uploads/1/3/4/3/134314144/fujez_gunakil_wuvorozemur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c4136584-fba8-419d-b515-0b47b7221dbb/philips_lifeline_npi_number.pdf
    • https://s3.amazonaws.com/nafoxuda/the_giver_chapter_17-19_discussion_questions.pdf
    • https://s3.amazonaws.com/verirejon/84831895875.pdf
    • https://uploads.strikinglycdn.com/files/01f0b5a4-6605-45cf-b888-a5bad67fc3c4/2361023602.pdf
    • https://s3.amazonaws.com/kujesulad/nabixajumofobedur.pdf
    • https://s3.amazonaws.com/zafirawit/carl_jung_map_of_the_soul.pdf
    • https://uploads.strikinglycdn.com/files/b627d055-11bd-44cb-8d8d-e69b20c8373f/19868250213.pdf
    • https://s3.amazonaws.com/vesubodufisi/past_simple_regular_verbs_exercises_macmillan.pdf
    • https://s3.amazonaws.com/vukujidor/32993440880.pdf
    • https://uploads.strikinglycdn.com/files/62241962-8a46-4a81-a8ab-d32e2e8d202c/how_to_charge_ups_apc.pdf
    • https://s3.amazonaws.com/mudurixo/64069126889.pdf
    • https://s3.amazonaws.com/tutasujal/brother_3170cdw_default_password.pdf
    • https://uploads.strikinglycdn.com/files/b61db9fb-166a-4a34-9c9b-2a19ba9560dd/dd_battle_map_grid_size.pdf
    • https://s3.amazonaws.com/girilifawuxi/what_is_the_importance_of_coefficients_in_a_balanced_chemical_equation.pdf
    • https://s3.amazonaws.com/gekojulog/whirlpool_duet_washing_machine_troubleshooting_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114ad.bin
17d3a70a30d7bcf8383d8d7c34cb41bc09513080740f6392b006939d7b9da421		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 5228 bytes
font_01_sfnt_off00012667.bin
1b79bc70cde3c3461b63da867bcb8f12112636a82a96f8254cbe5254b1679bf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12667 11900 bytes

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