Malicious PDF — malware analysis report

Static analysis result for SHA-256 502c78a40a2c7512…

MALICIOUS

PDF

74.5 KB Created: 2021-02-09 01:49:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 20fc223104e64fc572e88ec912244861 SHA-1: fa95274eacfc344f6828ab45fab88e93e37a1b58 SHA-256: 502c78a40a2c7512ced09f303673586e6506514856a4f78fe152a4c0ae543cf4
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with the primary one being 'https://baarspo.ru/wb?keyword=clinical%20chemistry%20text%20book%20pdf', suggesting a phishing or content-luring attempt. The document body, though partially corrupted, includes text related to 'clinical chemistry text book pdf' and the wkhtmltopdf application, reinforcing the lure. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest it's part of a phishing campaign.

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://baarspo.ru/wb?keyword=clinical%20chemistry%20text%20book%20pdf PDF link annotation
    • http://vezdesami.ru/social_media_marketing_business_plan8gize.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/iaiajh5/32666955697.pdfIn PDF document text
    • https://jubukukovojiri.weebly.com/uploads/1/3/5/3/135306868/vuvazuxagupiselobad.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/kofupagezugivix-pokiv-sososaziwaket.pdfIn PDF document text
    • http://toportt.online/baskin_robbins_full_sheet_cake_dimensionsay5ln.pdfIn PDF document text
    • https://sinegozedajosor.weebly.com/uploads/1/3/1/8/131871849/2046325.pdfIn PDF document text
    • http://kurs1.xyz/vurijobejiwipemesusaxat5bgjw.pdfIn PDF document text
    • https://xipasole.weebly.com/uploads/1/3/4/8/134853136/4214351.pdfIn PDF document text
    • https://wudowured.weebly.com/uploads/1/3/0/8/130873715/gijig.pdfIn PDF document text
    • http://nubokokepiw.iblogger.org/bootstrap_3_form_input_small.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jokilezitewoj.epizy.com/84219792063.pdfIn PDF document text
    • http://balesalefune.epizy.com/pdf_annotation_apple_pencil.pdfIn PDF document text
    • http://fobukisa.rf.gd/against_the_clock_movie.pdfIn PDF document text
    • http://poweradufuxi.epizy.com/biblia_hebraica_stuttgartensia_online.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_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 5672 bytes
SHA-256: 6c03da450eb98c014e76ce79a59713b5a8ed1a777cb2b270bb3baad8d19dccda
font_01_sfnt_off0000f8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 10592 bytes
SHA-256: bd252193e3650f901bb5f94f397b964129539110da9c0e2e6e0901f538869b63

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