Malicious PDF — malware analysis report

Static analysis result for SHA-256 a373ab2803d00f92…

MALICIOUS

PDF

70.0 KB Created: 2021-02-23 13:47:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b7f33ce5043751dd4c45c744a24ce96d SHA-1: ad1b89cbaf68086a248488cf37b5a487c8a2543d SHA-256: a373ab2803d00f92fbb58f033287fca19a7d325adfada7629636da3168d115a4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are associated with link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, likely for further exploitation.

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/strik?utm_term=goat+simulator+payday+buried+games+walkthrough PDF link annotation
    • http://najefot.22web.org/catering_business_cards_templates.pdfIn PDF document text
    • http://jamedoxeka.22web.org/kobazapiw.pdfIn PDF document text
    • http://shopsmmv.site/vampiro_la_mascarada_quinta_edicioncuybq.pdfIn PDF document text
    • http://organic100.fun/harlem_shake_poopxmdr4.pdfIn PDF document text
    • http://affilateapp.online/ruvejamidavawutebimetuyjnqd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408593/normal_5fefb309c5985.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374956/normal_5ff3f7f12a5ff.pdfIn PDF document text
    • https://xewaxamuroz.weebly.com/uploads/1/3/4/5/134529724/lolamegexaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378381/normal_5fd7783723b59.pdfIn PDF document text
    • http://sojuvofud.22web.org/jadepakogitos.pdfIn PDF document text
    • http://ejinaya.com/wheel_building_bookxnfej.pdfIn PDF document text
    • http://2220202.ru/reporter_definition_filmaygt2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420244/normal_60240eb92c7a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469836/normal_601f25d9bb84b.pdfIn PDF document text
    • http://nikecortez.net/research_methods_for_business_students_5th_edition_download44hrj.pdfIn PDF document text
    • http://lavkavkusa.store/cressida_and_troilus_summaryzz3vx.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://rukotig.rf.gd/dufupi.pdfIn PDF document text
    • http://mugekalamiwatek.epizy.com/40703470036.pdfIn PDF document text
    • http://vizaraxeforuzu.rf.gd/muxojatolemavixufidaf.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_off0000c71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71C 5576 bytes
SHA-256: a15d1d1e5a552eeb1b057ee4044e0e53fa609a19d04971dcfdfb94f3fa4f5ee0
font_01_sfnt_off0000da2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2A 10000 bytes
SHA-256: b245dbca0edc3856e246d5aee2d9f5cd4996ef667921491c9a4f5ec9c39bd167
font_02_sfnt_off0000fc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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