Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0311e7ce342e34…

MALICIOUS

PDF

88.0 KB Created: 2021-03-08 16:30:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c536814fd3e253b16d12134f50e35e34 SHA-1: aa7795aef81a3a092000649c217ea80da52c1b2b SHA-256: 8a0311e7ce342e341772a64b65de2f71896dc5ec37ec0712cf6d2e65925bad01
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate maliciousness. The embedded URLs, such as https://ponafet.ru/strik, are likely used to redirect users to malicious sites. No scripts were extracted, but the PDF structure and numerous external links point to a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=como+aprender+ingles+facil+y+rapido+en+casa+gratis PDF link annotation
    • https://gudeworidive.weebly.com/uploads/1/3/4/7/134767917/cc7353ac4663.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/josaxupefofuxafobufog.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/nojiwupireponiwebomepis.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/what_were_the_5_waves_in_the_5th_wave.pdfIn PDF document text
    • http://mezajozugabaso.getenjoyment.net/23697403393.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417998/normal_5ffa84e6df71d.pdfIn PDF document text
    • http://bexemusu.mypressonline.com/rusoloj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444875/normal_5fd7d4494a658.pdfIn PDF document text
    • https://xororawezajeber.weebly.com/uploads/1/3/5/3/135338150/3695626.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/takaki_a_different_mirror_chapter_15_summary.pdfIn PDF document text
    • http://bugenerefajujus.atwebpages.com/hunger_games_book_part_2_summary.pdfIn PDF document text
    • http://penanaras.myartsonline.com/ecuaciones_de_primer_grado_problemas_faciles.pdfIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_29f23cfaaf9f46dc8b2a7a9bc1db52c6.pdf?index=trueIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_1359988be873427ea1f03f2e605eec67.pdf?index=trueIn PDF document text
    • http://nojikigor.myartsonline.com/use_a_geometric_formula_to_evaluate_the_integral_calculator.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/73906438414.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_ca76b4203b164590a5b00e7f83ca67a7.pdf?index=trueIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_4c0918f6065c4dca9944f8c9910ab8b6.pdf?index=trueIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_e95d041b5fdf4be081d874c036758010.pdf?index=trueIn PDF document text
    • http://pejemevogoge.myartsonline.com/oreck_xl_air_purifier_parts_list.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_off00011990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11990 5484 bytes
SHA-256: 35dde7563e3790d07e62ebdffd6d77446b77d792f9a83ccbd4abd0e71ec2f53a
font_01_sfnt_off00012c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C29 11972 bytes
SHA-256: 88d909053211eafb16c9ee2dc6736b5001acd13d659876ee173a5a1362c0701c