Malicious PDF — malware analysis report

Static analysis result for SHA-256 720a5691f185db17…

MALICIOUS

PDF

80.9 KB Created: 2021-03-24 18:07:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d67f28f2ca27c61d15375755175fc5b7 SHA-1: b0bcfb29539a747e1e6cd4e64913540a7c9408ac SHA-256: 720a5691f185db170c1588380706e1c715d8fa38d8e09f8c5e2ade35b9380d58
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. The presence of a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggests an attempt to redirect users to potentially harmful websites. The document body contains garbled text, indicating it is not intended for legitimate user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/award?keyword=airforce+previous+year+paper+pdf
    • http://rewaxowaf.22web.org/ganapati_atharvashirsha_meaning.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_2abc7526a9ea4d64a341df606008737d.pdf?index=true
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_0929a047a9e540b195986506d4c0b5e9.pdf?index=true
    • https://c779a0a5-5a96-4308-8c37-720837e0bdd2.filesusr.com/ugd/4f1d02_06bfd5db03d1472fbf310429c7ec21a1.pdf?index=true
    • https://s3.amazonaws.com/murudute/nivuxujuvezagavivoxagul.pdf
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_5439be983c7146a8a905621a6fe2a644.pdf?index=true
    • https://uploads.strikinglycdn.com/files/61031d54-5df2-42a8-9e39-d9bc5aa6b24b/hamilton_beach_toaster_oven_rotisserie_instructions.pdf
    • https://s3.amazonaws.com/risisipajole/tetagejaxitita.pdf
    • https://617ecdd3-9f15-4ef5-8539-b0e2931b4c86.filesusr.com/ugd/55f640_42ee90d4b27f42528e737b53d3c74e7d.pdf?index=true
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_b97a30b945b94af797937d919859fccc.pdf?index=true
    • https://3c8d80e7-2998-4b53-b1db-ea2053e4eee2.filesusr.com/ugd/5c8c55_5160f609744041798f18cf2dc96dee4c.pdf?index=true
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_d67b1277fe8d4b20b9591621283fd582.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9c93738c-4a2f-4a56-ac37-0e751acfffaa/zelaxosobumenos.pdf
    • http://kepefemez.epizy.com/81754917603.pdf
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_959927fb9bc94a35b73e9a1ed13a2e5e.pdf?index=true
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_9de150e307954c8190c647f9174d244c.pdf?index=true
    • https://740e8036-3174-4dac-ae20-9eee1cd11a0a.filesusr.com/ugd/0f1c31_62fad819da6b47a2bb0c45583671c482.pdf?index=true
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_408b74142981428d9725fde1bd68488e.pdf?index=true
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_b10cb1d985ef4cdb8d88fdd6b8e5889b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/950303bb-38eb-4772-be28-65cf0d279df9/49585161304.pdf
    • http://waruzav.epizy.com/39674132980.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f300.bin
48b7fa7f9c3ad291ced0b3604efae34cfc80b73be7aabca7bb89bb93b0a8f42f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 5268 bytes
font_01_sfnt_off0001050c.bin
071386b96f023c509b3162cfc8e5fc55f1554b35d1752a5c339320423aecaa22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1050C 10940 bytes
font_02_sfnt_off00012a51.bin
ab0b30550c16f0218ea180a56450acc25083be48fb805cb0f6f475dfa13b8319		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A51 2832 bytes

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