Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4567d1d541ae82…

MALICIOUS

PDF

95.1 KB Created: 2021-04-22 20:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6a02d149dee772ae330ac9ee2b32bb63 SHA-1: 22b8b31d995c82e2b5bb194caacbcb577e33edad SHA-256: 1b4567d1d541ae829582cb0350bd24ffe32d50692c7e0e4209407a869988a09c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to disposable hosting and potentially malicious domains like xezojetit.ru. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the nature of the links and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=drinkwell+pet+fountain+parts PDF link annotation
    • http://xetorobexojukas.22web.org/pamegufeforedujisilanije.pdfIn PDF document text
    • http://mexuloxuxinona.iblogger.org/56856955497.pdfIn PDF document text
    • http://xuxuvojetuzutej.iblogger.org/2016_toyota_corolla_ce_wheel_size.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_e2f7775fefd548a7bee99d02f40644e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/214c1009-74d2-49ea-9037-aae069fc734b/jack_reacher_never_go_back_2016_online_subtitrat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29592696-6f3a-42ec-83f0-593a4e77c360/89878771781.pdfIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_005de7d51fce44d68d7223c1aed8b2c3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/415bda95-51af-4394-b486-fbb11f87a779/a_christmas_carol_movie_1951_quotes.pdfIn PDF document text
    • http://sodarag.epizy.com/manual_geladeira_brastemp_inverse.pdfIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_b947385e72dc4f4eb38b7004252797e3.pdf?index=trueIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_e04ac32464494f9baacea06d485fc5e6.pdf?index=trueIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_03377f2a33bf41be8a23e807e053228a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a6897a-ddfc-411e-9230-1d86256b0d05/arris_tg862g_ct_user_manual.pdfIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_e334c9e81abd4b528dd309f62a841364.pdf?index=trueIn PDF document text
    • https://d798de41-6847-46d1-b877-4f1b84f556ee.filesusr.com/ugd/3e315c_80fc2d3f01194d118ef70fef194fc97f.pdf?index=trueIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_cf94c221009442e8a9336ce7ab7d27ff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/789653a1-7f06-44ed-b313-86f229963f04/garmin_forerunner_620_bluetooth_pairing_mode.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_0ef2ac8b81ef417c9d68b372874fa14e.pdf?index=trueIn PDF document text
    • https://997b2cc2-d96d-4654-b184-8a5d7ad473c0.filesusr.com/ugd/b8d08c_90647e1b01f14d829e350c44c305d2c2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c40e321-ed1e-4921-9707-2681a47ed644/operating_system_concepts_9th_edition_by_silberschatz_galvin_and_gagne.pdfIn PDF document text
    • https://3c45aaf8-24f3-4cde-9773-cf44a0a970d3.filesusr.com/ugd/ae7d54_c7af0d9113a34c0595f87ade68f69248.pdf?index=trueIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_5046b49977bf4431ab58f8f5eadf6e09.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7C 4932 bytes
SHA-256: fc5c7cc7bc4cbe0558bcf7e110ca51973b0b0767751b5997559a5a0ccffd71d9
font_01_sfnt_off00013d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5E 10328 bytes
SHA-256: e4923d1c6209b31b03dd93184e66eb1f29dc1cb5dd03e22c2c6a977e280b76f0
font_02_sfnt_off000160c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C0 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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