Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8dd645e00b01d1…

MALICIOUS

PDF

65.7 KB Created: 2021-01-27 09:25:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: afb38aacb75b165f13259fb7a3d3ea31 SHA-1: 17ca28997abea96ba85e2c40c16188d700082523 SHA-256: df8dd645e00b01d1abf23518d739814990069e81137e51db32a1b41992123012
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of exploitation for client execution, likely via a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=precalculus+third+edition+blitzer+answers PDF link annotation
    • http://jotijitod.66ghz.com/vegetum.pdfIn PDF document text
    • http://vakekaninu.iblogger.org/pulubofefoloxawidexu.pdfIn PDF document text
    • https://cdn.sqhk.co/novimabe/ijihtic/83546574747.pdfIn PDF document text
    • http://nagajavanof.22web.org/autocad_2013_64_bit.pdfIn PDF document text
    • https://cdn.sqhk.co/kepebeso/hajdhcy/67454187213.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/voxazedisula/sejex.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/vivepolekikagorew.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/nikixofigorenepazejef.pdfIn PDF document text
    • http://lefanivewog.epizy.com/plant_and_animal_cells_staining_lab_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/kgb_archiver_latest_version_full.pdfIn PDF document text
    • http://lumapuxasut.epizy.com/sinujuxevadurore.pdfIn PDF document text
    • http://badizep.epizy.com/vafevifamokogob.pdfIn PDF document text
    • http://juwemijawikipo.epizy.com/.pdfIn PDF document text
    • http://zigubogujivo.epizy.com/kowagufiluwomaz.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/thinking_skills_worksheets_for_preschoolers.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_off0000c2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F0 5312 bytes
SHA-256: 7f53336cb77c25d9f4a8e4d589823d72710c8e141b84de53b4356f3d8c03b4cc
font_01_sfnt_off0000d50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50B 10232 bytes
SHA-256: bb9c558a3e71b4663c54081ae917e6305c3d8abb2fff53a978514fcfe8ba71fe

Open this report in the interactive analyzer, or submit your own file for analysis.