Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b3ef5a8f1f39cf…

MALICIOUS

PDF

70.6 KB Created: 2021-03-30 11:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb3ceede6490e7000e622e730d2356fc SHA-1: b2d85ea26c80f4b97f20456e4ffbf4a0e15e6f5f SHA-256: c2b3ef5a8f1f39cf8cb9a08603a556ff63ded66a807cf4a6be9e8d9f71515ac8
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The PDF's content, though heavily obfuscated, appears to be a lure for educational material, likely intended to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/award?keyword=english+alphabet+pictures+pdf
    • https://cdn-cms.f-static.net/uploads/4480880/normal_6016fcffd1f4d.pdf
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5fd662220ae91.pdf
    • https://static.s123-cdn-static.com/uploads/4382003/normal_60009f1677b5a.pdf
    • https://cdn.sqhk.co/dulinifijal/XijhguY/6534821242.pdf
    • https://cdn.sqhk.co/seponidozit/YX1Yf9n/nefukagodomogamoluwiku.pdf
    • https://cdn.sqhk.co/susojitigi/jeidgeG/generac_evolution_2._0_firmware.pdf
    • https://cdn.sqhk.co/xevezele/aaXArYa/nigix.pdf
    • https://static.s123-cdn-static.com/uploads/4368975/normal_5ff4004ed4e39.pdf
    • https://static.s123-cdn-static.com/uploads/4414680/normal_5fcc8937ecdc2.pdf
    • https://cdn.sqhk.co/midijanere/6zhiieb/zibexetunonabef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_d2af5d06690e4e0b9c2f34a4350546c1.pdf?index=true
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_9e7a7fc6ec9f4e4d8e1c6a9c79c6d477.pdf?index=true
    • https://s3.amazonaws.com/jasadavebaga/android_games_rpg_offline_free.pdf
    • https://s3.amazonaws.com/sixolose/40479362129.pdf
    • https://s3.amazonaws.com/ragejufa/how_much_is_a_baby_grand_piano_cost.pdf
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_a6ed46648ae94d8cba8ff27018be3d32.pdf?index=true
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_bf1d97fbd7ba46f48b2977e59816b5f9.pdf?index=true
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_034d6b4a3f31490084502f975bd35018.pdf?index=true
    • https://s3.amazonaws.com/wifukedot/lemupol.pdf
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_94b01b7f14d64361980134c2c1d76b3f.pdf?index=true
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_1356fc020cec429795fd9216eaa74151.pdf?index=true
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_3bb2976b8fd4462287c818fadc0a9b76.pdf?index=true
    • 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_off0000d6ac.bin
1d3d33d6750d414bbb258c91d9b85e25bd71d228d6377c838430f107531a3659		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AC 5512 bytes
font_01_sfnt_off0000e95f.bin
54c8116dc02592393effccc1efb35dad2272f9d3818945d2443588f3e45437b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE95F 10452 bytes

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