Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd76fea1d62b405…

MALICIOUS

PDF

75.0 KB Created: 2021-04-07 21:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0cc4042d29a64a35b35999b2b11b041d SHA-1: cd0e58c37bd371400fcd1832662889ea9944b968 SHA-256: 0fd76fea1d62b4056bbcb5093413d291efecffe4b38b847bf97104a3cc5fae4b
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links point to various domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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://resalured.ru/strik?utm_term=what+is+the+theme+of+the+story+metamorphosis PDF link annotation
    • http://topmassage.net/how_to_connect_multiple_monster_illuminessence_led_strips_togetherziqio.pdfIn PDF document text
    • https://ronunute.weebly.com/uploads/1/3/1/0/131070227/tewetejalusaxena.pdfIn PDF document text
    • https://tixovokibena.weebly.com/uploads/1/3/4/1/134109053/ec4aba.pdfIn PDF document text
    • http://eushopvmn.site/voguwimusumejobesetogkm5cd.pdfIn PDF document text
    • http://apple-fruit.space/521093608482beer.pdfIn PDF document text
    • http://tabikola.online/nicholas_sparks_novels84eyy.pdfIn PDF document text
    • http://tazogupiwelul.iblogger.org/economy_toeic_actual_test.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/egjpHyf/25956666725.pdfIn PDF document text
    • https://cdn.sqhk.co/zanudiwageg/uihY1hj/86100645212.pdfIn PDF document text
    • https://cdn.sqhk.co/jomurozop/gjibUXe/baxifamememodelerodupef.pdfIn PDF document text
    • http://euroshopmn.space/32642201427tywq2.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/1953451.pdfIn PDF document text
    • https://rimokukesezawuk.weebly.com/uploads/1/3/1/4/131437069/4076223.pdfIn PDF document text
    • http://hamsterbig.com/48313382170t5kgy.pdfIn PDF document text
    • http://myfirstsite.xyz/bissell_air_ram_cordless_vacuum_partsnwa2p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jamadex.epizy.com/66127500850.pdfIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_a4bcfa6185cc41d4a1937e34cd1359ac.pdf?index=trueIn PDF document text
    • http://rovijog.rf.gd/61200204213.pdfIn PDF document text
    • https://b42dfab6-8227-42c4-8fe5-fc04d9433513.filesusr.com/ugd/a9a8df_e459a9bc37da48b5bd78547e1129e9b7.pdf?index=trueIn PDF document text
    • https://7054f9d6-44ea-4b6c-8535-0d04e7cb9957.filesusr.com/ugd/963b03_bb1b5f5c9a2e47b6b11508204ef63a22.pdf?index=trueIn PDF document text
    • http://baxogezupeg.rf.gd/operations_research_analyst_jobs_california.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 5224 bytes
SHA-256: 94f8be978fbdd0af4a7bd3125fb6c65cdd3691babf6cb801de3a390acb193dbe
font_01_sfnt_off0000fbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB5 10076 bytes
SHA-256: e274ee1314d9eef4697abc2d12c01ed2a285913b4a9e249bcb2e804bda364ff5