Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc90c8f5e2b407df…

MALICIOUS

PDF

68.8 KB Created: 2021-03-28 12:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25af84c77347e1decfbd22bc9bca42e8 SHA-1: 79420b8b1298c15d6ab4d00f6f194d29fe9bd2df SHA-256: fc90c8f5e2b407df8c7bf6140770fa27002020de74781c0ca1640594e1a2fe1e
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to educational materials to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://druttle.ru/wix?keyword=geometry+chapter+4+standardized+test+answers
    • https://cdn.sqhk.co/waxuniwite/gOk7jEy/36340133067.pdf
    • http://gazopulodagifus.iblogger.org/extrusion_blow_molding.pdf
    • https://cdn.sqhk.co/mizosamox/vfMNgiO/galexikuvi.pdf
    • http://espaceabone.com/kings_of_capitalism_appw5kru.pdf
    • https://cdn.sqhk.co/wavoperusina/jdhbJrB/11305288348.pdf
    • http://brumbum3.xyz/mujercitas_libro_completoq9owj.pdf
    • https://cdn.sqhk.co/kelopifagisu/ndgiuhd/64156348589.pdf
    • https://cdn.sqhk.co/ninulekuto/h7WeEib/spiral_jump_free_online.pdf
    • http://gamedv.design/leigh_dovetail_jig_user_guideei9ad.pdf
    • http://xuwiropexij.iblogger.org/aromaticity_antiaromaticity_non_aromaticity.pdf
    • http://arendagg.xyz/yaesu_vx-170_service_manualur180.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/927ed7d7-382a-4c17-9da3-710b25fbc491/ralatevadasawiku.pdf
    • https://uploads.strikinglycdn.com/files/0083b9db-3f1f-4562-a932-d969e02b0d87/33713470992.pdf
    • https://uploads.strikinglycdn.com/files/58e64dcc-353d-42ad-adff-2a1638eab06a/how_to_download_sims_3_all_expansion_packs_for_free.pdf
    • https://uploads.strikinglycdn.com/files/08f2a2ab-d510-401f-917d-00dee691cc26/how_to_use_the_ti-83_plus.pdf
    • https://uploads.strikinglycdn.com/files/3f30f6b3-b1f0-4327-8086-d93805b9a58e/50231707230.pdf
    • https://uploads.strikinglycdn.com/files/54324674-f9fe-41df-8147-f578a5bfec4c/stihl_fs_55_rc_carburetor_part_number.pdf
    • http://fakatidewejuna.epizy.com/how_to_get_in_touch_with_ups_human_resources.pdf
    • https://uploads.strikinglycdn.com/files/3029a29e-2307-4ab1-9faf-3f6462a91a03/1734-ie8c_wiring_diagram.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_off0000cea1.bin
5eef5100c51b8434ce1cdfb4cc44806f071d7e111fdfb69cf19ee80cd550d560
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA1 5644 bytes
font_01_sfnt_off0000e1d2.bin
7fd106b1a1dfadc900ffa9ef590551ffda90cbfd0d576eea81b002f780ec29e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D2 10536 bytes