Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f6db20d28461f9…

MALICIOUS

PDF

71.7 KB Created: 2021-02-16 06:53:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1d812a86483114d0277b77fe7c806634 SHA-1: fbbf95f3f6d0a9ef2b8b763a052d498fe83bb534 SHA-256: 82f6db20d28461f982cff52f006bcfba60661f89d03c9c6eb793415d717e3cf2
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, 'https://yafferge.ru/strik?utm_term=how+to+report+dividends+on+tax+return+canada', which is disguised as tax-related information. ML classifiers and ClamAV also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/strik?utm_term=how+to+report+dividends+on+tax+return+canada In PDF document text
    • https://cdn.sqhk.co/tatidukigag/zihjaji/17243150436.pdfIn PDF document text
    • http://pajopoxofof.iblogger.org/canva_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/judawube/wjLjhjh/child_care_aware_nd_login.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/dry_cleaners_website_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/hitchhiker_s_guide_towel_day.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/low_back_pain_management_guidelines.pdfIn PDF document text
    • http://duzesonugineku.rf.gd/reduce_smaller_size.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/konuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/kakigezumote.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/que_son_los_armonicos_electricos.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/self_appraisal_report_format.pdfIn PDF document text
    • http://safodur.epizy.com/mac_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/2241302734.pdfIn PDF document text
    • http://fefiraxubuviwep.epizy.com/damejupodixirukuviveje.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/ponapalilirawugamuzexe.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_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 5216 bytes
SHA-256: 697a8ca43b63bdddd3719c96d59b5a1b332a23c5c4ad96996f3829a4129070ce
font_01_sfnt_off0000eccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCB 10824 bytes
SHA-256: 9a7093de4f2764dc9357b8cfcb4ec903642125fb6de70c5bacb419e51543fcc3

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