Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f1ba3049670ee8…

MALICIOUS

PDF

80.2 KB Created: 2021-03-23 06:00:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c06622f01479b5e515bf991b02335037 SHA-1: 893419c0894cfeaa6121fa7d465098a2a0968441 SHA-256: a5f1ba3049670ee82ba87e7a276874b6ef2c6d3be1663fa19a7fb2ed2363c4a3
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and a potential phishing or malicious document. It contains numerous external links, with one pointing to 'https://kuzutuzo.ru/strik?utm_term=wii+safety+man'. The ML classifier and ClamAV also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/strik?utm_term=wii+safety+man PDF link annotation
    • https://cdn.sqhk.co/posiraki/jgetCMA/youtube_tv_vs_hulu_live_for_sports.pdfIn PDF document text
    • https://cdn.sqhk.co/lonubugogere/Vghcsig/41578916368.pdfIn PDF document text
    • https://fegilekupajot.weebly.com/uploads/1/3/4/4/134404616/c9423.pdfIn PDF document text
    • https://gobodukigibab.weebly.com/uploads/1/3/1/8/131856162/5d823.pdfIn PDF document text
    • https://cdn.sqhk.co/niwexifa/hbcji80/download_game_super_stickman_golf_2_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pusuvizodez/pijzS4u/tibapivifu.pdfIn PDF document text
    • https://cdn.sqhk.co/belesobikezi/giejjhe/using_don_t_and_doesn_t_worksheets.pdfIn PDF document text
    • https://fevebelok.weebly.com/uploads/1/3/4/0/134012800/vaxujepovosuz-mepapibeku-niwifojowum-kimudis.pdfIn PDF document text
    • https://cdn.sqhk.co/xoraxuvonaf/dgigdhb/cirrosis_hepatica_fisiopatologia_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/kurazagizub/zEmhfjg/clash_royale_private_server_ipa_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/kisibijobu/ahi35ab/wafosakaro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/9102fc02-a440-40f2-9a3c-9028c5e82830/cyclops_colossus_spotlight_charger.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/adobe_reader_x.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/fanevus.pdfIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_481870653ca3494ba977e71fa125a0ee.pdf?index=trueIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_0c1afc03d09048e98c9f7586c9671ea3.pdf?index=trueIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_7ec00e63dcde44559d19c32c7e7c678d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/14353450664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ed1709c-07ba-4892-a6fd-aa0099d9349e/73722813749.pdfIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_28e0d4aaf0944de6b532f6888f520cc2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajixe/puxujolibezevutisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bcec76c-0528-4a8c-8890-171723756bd6/41895338455.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 4900 bytes
SHA-256: a2c6fc1d9f8c60eab057f11b7bdd05ec4c34a16bbc19911ba75ee70094bb3fe9
font_01_sfnt_off00010360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10360 10860 bytes
SHA-256: 773c5a22674ed633dd9af32e14132602a6bbab83c487efd81b8c766a61404e43
font_02_sfnt_off000128dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DD 2616 bytes
SHA-256: c2801e3c7c948aab6fcba4baf995138318bd33128f9bf655d7c50697380e974a