Malicious PDF — malware analysis report

Static analysis result for SHA-256 5182ff316bba12ba…

MALICIOUS

PDF

84.3 KB Created: 2021-02-18 00:20:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 65c15d03eaab06661aadec85a886c384 SHA-1: e5f10f84cb9664941f7bcb7c0241b14b36fb5067 SHA-256: 5182ff316bba12ba5af5bf7f1b826c6cfeeda4e94dff4a2f8a7264e7f3de4f97
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external URIs, with one prominent URL pointing to 'jottigo.ru', suggesting a phishing or malware distribution attempt. The PDF structure and embedded links indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jottigo.ru/123?utm_term=what+are+political+cleavages PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428341/normal_60162965bb8b9.pdfIn PDF document text
    • http://ryukzak.digital/adobe_cs6_serial_numberpaw3l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420903/normal_5fdf88341ecad.pdfIn PDF document text
    • http://gofipupeseg.22web.org/fill_in_the_blanks_with_articles_worksheets.pdfIn PDF document text
    • http://freud.icu/guzibaruxirunvs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486971/normal_600ce44964a33.pdfIn PDF document text
    • http://choosenews.space/cause_and_effect_worksheets_grade_6x3xre.pdfIn PDF document text
    • http://topchambre.xyz/daycare_information_sheetf3rhd.pdfIn PDF document text
    • http://rifosavepi.22web.org/91568817309.pdfIn PDF document text
    • http://bunnygummy.ru/munidetewetewuxijexasm68h4.pdfIn PDF document text
    • http://madifowagerotal.iblogger.org/mepufurevawiz.pdfIn PDF document text
    • http://rating-bookmaker.ru/vanilla_balance_druid_leveling_guide9eqro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407064/normal_6008317154c96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lebevinawefebo.rf.gd/bookkeeping_excel_template_free.pdfIn PDF document text
    • http://xutagefev.epizy.com/canadian_vehicle_bill_of_sale_form.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 4952 bytes
SHA-256: 09978be03cee7dbb43b853020f35822e7d7a1eb3ee7608576f316187eef19dad
font_01_sfnt_off000110b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 11232 bytes
SHA-256: 1065149d0e3d499e890823a0a5667128b1e5b76e0a54294f1255eac83c0e752d
font_02_sfnt_off00013658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13658 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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