Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f83b5be54d95c89…

MALICIOUS

PDF

86.3 KB Created: 2021-03-14 00:32:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d859daa235485f3e5486a6ca51a87b2b SHA-1: 18ad80e0cc14e0b4f355de05f9e35d646a30735b SHA-256: 2f83b5be54d95c89ada21d278f7622c3687ed2d73ff0f8e9bd6ded4119dc8e4e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, particularly the one pointing to 'xezojetit.ru', suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly imply an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://xezojetit.ru/strik?utm_term=albert+pike+tire+%2526+services+hot+springs+national+park+ar
    • https://sovejugi.weebly.com/uploads/1/3/4/6/134652237/donukabegiwumowuni.pdf
    • https://dudidupu.weebly.com/uploads/1/3/1/3/131380390/falaxawuzilib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/97d0ddb3-7df3-48cf-b9b4-33c94e8222c0/xixozimixokotavukanan.pdf
    • https://uploads.strikinglycdn.com/files/b9141898-6eb8-455c-ab81-0cb8286cb7a9/what_is_aisi_1040_steel.pdf
    • https://uploads.strikinglycdn.com/files/bdf40ba9-ad4e-4c9b-b1b2-00bf8324e02b/59906608913.pdf
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_675fefeaa5824347bcbaea311041fc4b.pdf?index=true
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_1ee3150d7b104016ac4435914a8e4359.pdf?index=true
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_ea19d23a4e264587b33ea71a5f07d922.pdf?index=true
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_d15b35fa4e0448f0bdf586997e2a4120.pdf?index=true
    • https://uploads.strikinglycdn.com/files/df9f0236-c3b0-4a0f-9794-b06cbf9b332c/ganosupax.pdf
    • https://uploads.strikinglycdn.com/files/03af17ef-32af-4562-aff0-d26ea84eb7c5/gedomufetarenesepo.pdf
    • https://uploads.strikinglycdn.com/files/1b2489e6-58d0-435e-8187-2771a4f312e2/buwuw.pdf
    • https://uploads.strikinglycdn.com/files/50d0fee6-c0b6-4203-8bb9-10e93c1355de/43716686000.pdf
    • https://uploads.strikinglycdn.com/files/dbd15ae3-5556-4789-a552-745e1ac7fc4a/how_to_write_a_good_compare_and_contrast_essay_introduction.pdf
    • https://uploads.strikinglycdn.com/files/14253162-840d-41ab-9235-fad876e0bd2f/82415068751.pdf
    • https://uploads.strikinglycdn.com/files/88237224-cd5b-492f-865b-89393ee98b93/xafovifokegizala.pdf
    • https://uploads.strikinglycdn.com/files/946f1c26-e76a-48ab-8ecc-d2d15c957a5b/63991088869.pdf
    • https://uploads.strikinglycdn.com/files/61cc428f-887d-40f6-8edb-f68270c24f2e/free_download_mp3_al-quran_30_juz_ahmad_saud.pdf
    • https://uploads.strikinglycdn.com/files/c5ee5b12-b901-489b-8c86-471aae949542/canon_mx922_change_print_head.pdf
    • https://uploads.strikinglycdn.com/files/e8593a37-e74f-430b-81f2-261853146089/why_does_zmodo_says_device_offline.pdf
    • https://uploads.strikinglycdn.com/files/1aa6ed6f-6339-42a1-aac4-a180a993e3a1/dusadowuzan.pdf
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_e7fc3df8c0cf40cea148223885c62a98.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a104cbfb-dd48-49df-8196-f7b2e0b5d70e/navy_eval_bullets_examples_e6.pdf
    • https://uploads.strikinglycdn.com/files/011516d0-08ff-4587-92ce-a8f0c37c5b7e/multivariate_analysis_definition_marketing.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6de.bin
0d1326310e186f66480898f0ac5583298b0a7998b34f23e4467f4348136d7835
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 4616 bytes
font_01_sfnt_off00010698.bin
cf50d13c5c21d2e34fba0d9dd21119d4839fc35fdaebfe62cbacf51850cc328d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 1936 bytes
font_02_sfnt_off00010fd7.bin
c5b9c72aa05d2cae3c21015c6f712aa76cae7b614dcbc8bc9cbb733217fafda4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD7 10928 bytes
font_03_sfnt_off0001358d.bin
8976f08d19289f394670e95003dbd7e43d40ab5e55cac77d8d2bd4f89a3a4620
pdf-font-stream PDF embedded font (sfnt) at offset 0x1358D 16392 bytes