Malicious PDF — malware analysis report

Static analysis result for SHA-256 1091e69079df0d47…

MALICIOUS

PDF

77.5 KB Created: 2021-06-09 06:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 671e1883abed16ca4a2ed822e6d91c71 SHA-1: 0ebeb0e723803726f21bd6dced928aab0483e785 SHA-256: 1091e69079df0d47dbd4ae0a40190ac0b4602600fa88365662681b8ec69ec116
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to 'drafthe.ru', which is flagged as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/pbw?utm_term=papa%2527s+bakeria+to+go+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412758/normal_6046407c1c35f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369793/normal_605ac1bd1091d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365525/normal_5fcfa466740d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383444/normal_5ff3b50c92c33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470972/normal_5ffc37c89cc32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4526930/normal_601254473e960.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476127/normal_603b109cad753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404497/normal_602a3f9e37e56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464078/normal_602bb4cb1590a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474999/normal_6058ff66b3a3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391335/normal_5ff9cb627adb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368952/normal_6062b28dcb07e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zovafidat.pbworks.com/f/penology_and_victimology_law_notes.pdfIn PDF document text
    • http://fodorafirig.pbworks.com/f/xilepijofadumuzof.pdfIn PDF document text
    • http://wirabofitox.pbworks.com/w/file/fetch/144822306/pojemudubuvodarufafofo.pdfIn PDF document text
    • http://sewafebi.pbworks.com/w/file/fetch/144426570/fnaf_the_fourth_closet_free_download.pdfIn PDF document text
    • http://wuwolufit.pbworks.com/f/6638227774.pdfIn PDF document text
    • http://bovozajezo.pbworks.com/f/lefizigugapekemovefuvogiw.pdfIn PDF document text
    • http://redelaw.pbworks.com/f/chhattisgarhi_movie_480p_download_sites.pdfIn PDF document text
    • http://xibosini.pbworks.com/w/file/fetch/144738141/propiedades_fisicas_y_quimicas_de_los_hidrocarburos_insaturados_alquenos_y_alquinos.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF31 5196 bytes
SHA-256: aa8b8d09d39ecf46f86dc1923664f946f561d92dbf444b42a18028f805c115ec
font_01_sfnt_off000100f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F1 11248 bytes
SHA-256: 3269b6630c881c6eeb112bb77226884a546993698f6ee4c066ac872c5ae36678

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