Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f086b9db6eac29…

MALICIOUS

PDF

145.2 KB Created: 2021-04-07 10:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: abe7ad742c72c0db75a93e57b8ea15b4 SHA-1: e51ef10410a84d54aec6373262aa7b1e5d884b5d SHA-256: c5f086b9db6eac2916d6c935e1de47a4bc5f2bbd8275767cfe7562b85f1a51aa
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://gimoguvi.ru/strik?utm_term=what+are+the+principles+of+quantum+mechanics PDF link annotation
    • https://bigonukoduxa.weebly.com/uploads/1/3/2/7/132741189/botut.pdfIn PDF document text
    • https://nujelojebalu.weebly.com/uploads/1/3/4/6/134690198/fuderexokarozor-giwitopodi-sisatipinomer.pdfIn PDF document text
    • https://wozibasibif.weebly.com/uploads/1/3/4/8/134868806/wefefevifapix.pdfIn PDF document text
    • http://kiteleminokovi.22web.org/japozolefewa.pdfIn PDF document text
    • https://tiwavejesuma.weebly.com/uploads/1/3/2/6/132681866/8478888.pdfIn PDF document text
    • https://mamowolo.weebly.com/uploads/1/3/4/7/134714390/korinizijirak_fijupivojo_jetesodigasu.pdfIn PDF document text
    • https://mibigadoguful.weebly.com/uploads/1/3/4/7/134759919/4535715.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6828ddf7-2fcf-4e04-beda-520e1fd8d154/wibajopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ffdf948-8859-40e4-b86d-70c1fccd7e2f/management_of_organizational_behavior_8th_edition.pdfIn PDF document text
    • http://ripifozuj.rf.gd/fubesumejurujuv.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/corporeal_beast_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/70-411_exam_dumps.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/blocboy_jb_mercedes.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/advanced_excel_course_online_free_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/cbse_answer_sheet_front_page_format.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/brahmanaspati_suktam_sanskrit.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/todusaw.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/samsung_hmx-f80_price.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_off0001fac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FAC7 5396 bytes
SHA-256: 3129930f834c3b68154d2724c7cd553b5eaa59ed6d52aeadf06a9c40f9cd5519
font_01_sfnt_off00020d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D06 12748 bytes
SHA-256: 81cc462b57b2aaa4ea9f00e76bb8d45a0a505382a472a3453fa50dd6b0ca68d1

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