Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fceb509226aeff…

MALICIOUS

PDF

78.5 KB Created: 2021-03-24 09:49:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b016a99463feac219129d4b31b294289 SHA-1: f3e14180fa0545a2e93034a8f58c26748f236fc3 SHA-256: 75fceb509226aeffc9819458aa86657f908eb4717e268a6fe798272eba0a18cb
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 pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely 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 0.9993

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://jumiwimov.ru/award?keyword=cnc+machine+types+and+uses+pdf PDF link annotation
    • https://nenejafaf.weebly.com/uploads/1/3/5/3/135393494/bobimogotiko-limudixu-vamalados.pdfIn PDF document text
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/0795c439dc56546.pdfIn PDF document text
    • http://sajutasure.22web.org/8261227288.pdfIn PDF document text
    • https://buzixigadojaw.weebly.com/uploads/1/3/5/3/135316262/012c5a37a57bd.pdfIn PDF document text
    • https://bazulerijodinib.weebly.com/uploads/1/3/1/8/131856415/livovugelub-vikibodowepa-zebilewurena.pdfIn PDF document text
    • https://peruvapi.weebly.com/uploads/1/3/0/8/130813059/tuwopoxubutuvopo.pdfIn PDF document text
    • https://jotabejomunumog.weebly.com/uploads/1/3/0/8/130813846/f3b9f01d0a7b.pdfIn PDF document text
    • https://solovetimu.weebly.com/uploads/1/3/4/8/134879252/mojel-batumagaf-gosatovidedixo-tejoluzuk.pdfIn PDF document text
    • https://gogijufiwadika.weebly.com/uploads/1/3/4/5/134581681/34e6525.pdfIn PDF document text
    • https://baminivosawu.weebly.com/uploads/1/3/4/7/134701136/juxixafuzezub.pdfIn PDF document text
    • https://xuzonikafu.weebly.com/uploads/1/3/5/3/135351414/rivibelomewipub.pdfIn PDF document text
    • http://ruzeviliv.iblogger.org/96901688575.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_2690387a5629482480aa8c78ceef2fc9.pdf?index=trueIn PDF document text
    • http://kibibozo.rf.gd/67666969020.pdfIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_cfae2b8b06e14df69f6da0690557882a.pdf?index=trueIn PDF document text
    • http://dasanurarad.epizy.com/sap_bods_interview_questions.pdfIn PDF document text
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_25acffcd92ab4e79847855d12dff94d7.pdf?index=trueIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_baa25928e0314aaab7604927d570c0c5.pdf?index=trueIn PDF document text
    • http://luwefotikejumu.rf.gd/score_sheet_template_basketball.pdfIn PDF document text
    • https://8ab8d0a6-ebcf-4503-ac90-3c5d9a0926ce.filesusr.com/ugd/8585d4_d19bfff58d8547a2b3c2b1c8e0c93ec7.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_5dc8042c2e3d451f9fea4beaf524cdb3.pdf?index=trueIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_99de04e9310d4b15adabbcf17e0a2379.pdf?index=trueIn PDF document text
    • http://lojeler.epizy.com/alcohol_dependence_scale_ads.pdfIn PDF document text
    • http://wedusumefixikeg.rf.gd/myers_briggs_personality_test_type_descriptions.pdfIn PDF document text
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_28dc4c3bf69c493891c0ab7c1713fd6c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 5276 bytes
SHA-256: a9d55bb0ad74f0e2713ea470730e345e25f2eb00d6a0435cec9ad64f57a2aefc
font_01_sfnt_off000105b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B5 11064 bytes
SHA-256: b8c34d3e527e96a13d57a466c125d22703422e4f23c816f50ff3ee37f3326351

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