Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8ba550dd254ef9…

MALICIOUS

PDF

90.2 KB Created: 2021-04-06 14:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d27dc860d2d2956e6605b05c43864821 SHA-1: 7b49c1f3df4b301f1809f261bc47b27a7ece0d07 SHA-256: 0f8ba550dd254ef9ff67e864c353bd66b5ed921f7042a784913105523e59b800
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which are generated and appear to be part of a link farm designed to manipulate search engine results. The primary malicious URL identified is https://xezojetit.ru/wix?keyword=linear+programming+word+problems+worksheet+2, which likely serves as a landing page for phishing or malware distribution. The document's content, though heavily obfuscated, suggests it is masquerading as an educational worksheet to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-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://xezojetit.ru/wix?keyword=linear+programming+word+problems+worksheet+2
    • https://cdn.sqhk.co/lutakakijuro/5FKjhjd/khuda_haafiz_box_office_collection_wikipedia.pdf
    • https://fosevikotik.weebly.com/uploads/1/3/1/6/131637163/2162920.pdf
    • https://cdn.sqhk.co/tatidukigag/ggiqiad/average_cost_to_build_a_house_in_utah.pdf
    • https://mimevomakiket.weebly.com/uploads/1/3/4/6/134693464/wojukuniwisuzikega.pdf
    • http://kopatizukuxaluj.scienceontheweb.net/87017505384.pdf
    • https://cdn.sqhk.co/zepipawetopi/Yjijb0C/firep.pdf
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/e0cd103503.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_f3f412c5b3674fd8b0c01b3203240c90.pdf?index=true
    • https://uploads.strikinglycdn.com/files/15a25a43-751f-4313-9344-421576166c15/how_to_remove_samsung_uhd_monitor_stand.pdf
    • https://uploads.strikinglycdn.com/files/63cfe427-19bb-41b6-8903-f9614a9fb79d/todd_lammle_ccna_book_free_download.pdf
    • https://uploads.strikinglycdn.com/files/f4de8992-5754-4207-9acd-3e3ffc6b72b0/how_long_to_watch_all_of_the_lord_of_the_rings.pdf
    • https://uploads.strikinglycdn.com/files/1fc064f0-5520-42dd-b6bc-3ac595800f9f/26652463617.pdf
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_cf608e981ad8489e95cfebd89d43e33b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6f5300cf-13b8-43d2-a41a-bc8bf163d6cf/2000_jeep_wrangler_rust_repair_panels.pdf
    • http://susabumo.atwebpages.com/rubajuregi.pdf
    • https://uploads.strikinglycdn.com/files/46a942b0-25b0-495a-b823-e39bde9d6c8e/sensus_water_meter_touch_read.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_off0001213e.bin
e36adca9037b149d3f4e5534d9e8ca28e769e08edeba7a0cd27a87fb6782fc80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1213E 5740 bytes
font_01_sfnt_off000134a9.bin
6a0fbfa48c6836ffed35a0a0609496aa9963f9163041c9add134e482aa146f27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134A9 11524 bytes

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