Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc43574577d359cb…

MALICIOUS

PDF

89.5 KB Created: 2021-03-29 14:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9c5c02aa94eb1fcfb0af8a37dc680a1f SHA-1: dfc0008bf6fdb36fa08b1ddd12d3781c8ea2c50f SHA-256: fc43574577d359cb2807d2afbed0658fb0667176ce1d197565bdf8857e47bf79
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or redirection scheme. The document body, though heavily obfuscated, contains metadata related to its creation, which does not directly indicate malicious intent but is consistent with a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/award?keyword=importance+of+health+and+safety+in+the+workplace+pdf PDF link annotation
    • http://vienvozvrat.site/80769397999kqik0.pdfIn PDF document text
    • http://volalagokiva.sportsontheweb.net/36764057644.pdfIn PDF document text
    • http://tasigezagu.scienceontheweb.net/what_is_the_definition_of_christian_morality.pdfIn PDF document text
    • https://cdn.sqhk.co/fekerepusa/d1I7NDn/modern_history_tv_music.pdfIn PDF document text
    • http://sijiwepi.mypressonline.com/falling_upward_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/hfkZrgd/fogodiguxofozodebemaja.pdfIn PDF document text
    • http://domobifotuza.sportsontheweb.net/what_are_some_other_words_for_confused.pdfIn PDF document text
    • http://fuwiduwoxobol.mygamesonline.org/purezukipigotuwedogulesiz.pdfIn PDF document text
    • http://golden-bridge.pro/65438815072mxesm.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/fuxodol.pdfIn PDF document text
    • https://cdn.sqhk.co/jawefujivi/ghT0fii/90691086166.pdfIn PDF document text
    • http://xopaberowiwin.getenjoyment.net/pathogenesis_of_meningitis.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/iiyggif/space_needed_for_4_chickens.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_f2d3bbad9e2a4fe9b5fa2749dd9da2db.pdf?index=trueIn PDF document text
    • http://begujewirefe.myartsonline.com/bisexuality_in_the_ancient_world.pdfIn PDF document text
    • https://5b3a2631-baab-4d1f-8161-183aa5bfd7a2.filesusr.com/ugd/5dc2b7_efc21121e00b44aab10e30366cacac15.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/42272441041.pdfIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_b14051b672ed4fc2b42daed25e0501f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/jifamekisojimavovuzixezur.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/shayari_video_full_hd.pdfIn PDF document text
    • http://riveminigokoxa.myartsonline.com/muliperumapos.pdfIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 6556 bytes
SHA-256: 7dfbd517c54765f327b0de2446bab6e56b1da55641e5f265b7fcec5271c7148d
font_01_sfnt_off00010b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5B 5588 bytes
SHA-256: 93e2caa1b4972909247346a24788f96281c6d19a6f19895909deebac0fa5ddf3
font_02_sfnt_off00011e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E44 10772 bytes
SHA-256: 21bb13c1387435ceff69b9c6ca4aa23800492bacf900c4dc5d6f2d87ca12411f
font_03_sfnt_off00014328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14328 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550