Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c7e9d65d0eeec8…

MALICIOUS

PDF

72.3 KB Created: 2021-02-23 03:36:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c28bfbc7fb9a222e8b975bee2200d652 SHA-1: d19ffb24276764345ba841e8da71d7a8ea8fa623 SHA-256: 05c7e9d65d0eeec8d59bdd9c27ad586c171535ee6402eec2d81dc71d69993d44
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

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://druttle.ru/strik?utm_term=is+the+jbl+charge+4+better+than+the+jbl+flip+4 PDF link annotation
    • http://yourbigdick.space/91024196967015jg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_602f76c384a03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452852/normal_5ff4a6a931e0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456663/normal_600512ffe6f0f.pdfIn PDF document text
    • https://cdn.sqhk.co/kapokosop/wghsNif/petalameruzig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448746/normal_601a41a6ab877.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496824/normal_5ffc2da0a018e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393503/normal_603432c5269a3.pdfIn PDF document text
    • http://topfrag.rip/riwebibuzuxokegeriwunakikvn152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488807/normal_601b578653188.pdfIn PDF document text
    • https://cdn.sqhk.co/rapalaxob/Hjejjcw/filelefomuzaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423188/normal_6010c71ea25bd.pdfIn PDF document text
    • http://sandwichhq.club/asus_p8z77-v_pro_compatible_processorssr3b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384470/normal_6015d5252408b.pdfIn PDF document text
    • http://kolomata.ru/what_is_the_meaning_of_accommodation_bill_of_exchange949m4.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/pusixa/berofemobuxowizu.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/vosotikuvetirowuzovedorob.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/reglas_de_acentuacion_segun_la_real_academia_espaola.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_off0000dc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9A 5520 bytes
SHA-256: 9929567e91afdb06889a51d5874ca243fff33c13212cf39c1c142858fdebee2f
font_01_sfnt_off0000ef64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF64 10812 bytes
SHA-256: 8163ebd448f184b96e5f1c2df8545426dd1913bf937f99a55fd989fdede4c2e6

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