Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f62db7e4f8f0c8…

MALICIOUS

PDF

74.2 KB Created: 2021-04-16 18:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4b5320bd803e086c2a5860e660001b32 SHA-1: 2003fdb7d4d3f317fd34f2719a31ac6dfc576799 SHA-256: 33f62db7e4f8f0c85a6a02e92a6e659ab277fa4b28ff111e28c15d6a15d680d3
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs and the nature of the heuristics point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/strik?utm_term=fingerstyle+guitar+tabs+korean PDF link annotation
    • http://xazonojader.mywebcommunity.org/pevizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483337/normal_603605147d265.pdfIn PDF document text
    • https://xavexipaw.weebly.com/uploads/1/3/1/6/131636683/nonodiwuxinasig.pdfIn PDF document text
    • https://dofudovi.weebly.com/uploads/1/3/6/0/136092117/fotozol.pdfIn PDF document text
    • https://wubenigulusetib.weebly.com/uploads/1/3/4/7/134712949/dutexezu-putobapabogubix-demagalivap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450138/normal_6020b5a6c0b17.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/lirufujufejat.pdfIn PDF document text
    • https://dofufegudi.weebly.com/uploads/1/3/1/3/131381881/7861572.pdfIn PDF document text
    • http://gigurokubi.66ghz.com/gamilurokud.pdfIn PDF document text
    • http://torixewiser.medianewsonline.com/tsc_maternity_leave_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459641/normal_606052cf06c4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2b01876c-5741-4e94-bfb6-30973e4a6517.filesusr.com/ugd/45d688_30faa5aa487f400f9fbd2e86132fefd5.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_01f02a861a0a44f497d6425b647a55b5.pdf?index=trueIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_6b84b75a92cd4722b099ce7dc0d79c6a.pdf?index=trueIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_11b824f4bea14b5b92c4a745b9fe6096.pdf?index=trueIn PDF document text
    • http://mipagolawalixa.onlinewebshop.net/gonupamujeni.pdfIn PDF document text
    • http://satawakerexe.atwebpages.com/2nd_conditional_exercises_with_answers.pdfIn PDF document text
    • http://vipoxegoto.rf.gd/formation_accueil_tlphonique_en_anglais.pdfIn PDF document text
    • https://b1394492-4877-47b1-8bf2-e962974baa99.filesusr.com/ugd/3e4b7a_69987a73a8d1455398cb9c04b2e3bc06.pdf?index=trueIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_22ec837648524b8e8e819fd98fb8f729.pdf?index=trueIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_5cd86f61305f48acb57e5178d44c013d.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_off0000d803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD803 3008 bytes
SHA-256: 121545e06d4479f025dc9cbfecf4b319e8d5ed1dd4d751a865aec1cc503d2a93
font_01_sfnt_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 5116 bytes
SHA-256: 53ac5bda101027de2743dd0fac2bf123bf6e564d1efa44744f895c0cf5a0e285
font_02_sfnt_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 11000 bytes
SHA-256: e243447fe6b14afea4302efc449b67886e8f64d01b2d5ce199ee7e05f20f187b