Malicious PDF — malware analysis report

Static analysis result for SHA-256 608f36e8b56ea073…

MALICIOUS

PDF

74.4 KB Created: 2021-05-13 15:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: efc6d1534b337f869a6a5115251643d7 SHA-1: d961c65a83da44a6273d5ffc30e52aabf4e9d182 SHA-256: 608f36e8b56ea07385c2d8be7c588dd4cf0b28db23dfbc5ff3a7ec7af2928e82
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'jolly phonics workbook 7 pdf calameo', suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=jolly+phonics+workbook+7+pdf+calameo In PDF document text
    • https://cdn-cms.f-static.net/uploads/4471969/normal_606b325d5184c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414679/normal_604711a99de96.pdfIn PDF document text
    • http://pokulumaj.iblogger.org/arithmetic_series_word_problems_with_solutions.pdfIn PDF document text
    • http://unosital.space/zodumijozufikejh2hn1.pdfIn PDF document text
    • http://blaugrana.ru/monster_arena_checklistr5pl3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453342/normal_5fd9de617163f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455660/normal_5ffa0ed471a74.pdfIn PDF document text
    • http://negeduji.66ghz.com/pumafe.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/nanasulegumazidanisej1fpi.pdfIn PDF document text
    • http://zewugivufo.22web.org/how_to_pass_chem_100.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://texaliborobiko.epizy.com/59807767524.pdfIn PDF document text
    • http://guganukipajaxi.rf.gd/clostridium_difficile_bacteria.pdfIn PDF document text
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_53775b50bc964b698d9d395ba9c577b9.pdf?index=trueIn PDF document text
    • http://sibazod.epizy.com/uad_apollo_twin_x_duo_vs_quad.pdfIn PDF document text
    • http://xelidamos.epizy.com/arjun_reddy_bgm_in_320kbps.pdfIn PDF document text
    • https://921790ca-7b53-43bd-a25d-275d6f056404.filesusr.com/ugd/9d24cb_da49bce3607b4cdb96bd5c0c8e477ca4.pdf?index=trueIn PDF document text
    • http://xupizoxodigumir.rf.gd/27739013912.pdfIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_0e593691f6b1452088738dd69aab9dbf.pdf?index=trueIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_b2cbcb8da1d54105be46041211325018.pdf?index=trueIn PDF document text
    • http://pepiretivixu.epizy.com/romeo_and_juliet_movie_online_leonardo_dicaprio.pdfIn PDF document text
    • http://jepuxaribizoze.rf.gd/all_quiet_on_the_western_front_ebook.pdfIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_07f86909e46d4c0488fda3ed94f9e5f6.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE52 5860 bytes
SHA-256: a9742e38523f01e6734d4e256a9e2352cae25581c8eeab6a5a734b9ca37b5769
font_01_sfnt_off0000e233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 9944 bytes
SHA-256: 999f773323f9bcdb59bd0101a24040a7122028c76d98dd37ab2369c783f9509f
font_02_sfnt_off0001048a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048A 16736 bytes
SHA-256: a4b6321daf764c051571de4b349c55f1fd16d8b8123a87b34f113650caa8d64c