Malicious PDF — malware analysis report

Static analysis result for SHA-256 de770f53c131666e…

MALICIOUS

PDF

69.0 KB Created: 2021-03-02 02:41:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b477619cb35fbf88a0735105dfe17105 SHA-1: 80b616b4d77107c1422719b167605ceff9eb3d8b SHA-256: de770f53c131666ead2b22dd0726abdf09eae667b985219653957d76f2046b26
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=fundamentos+de+quimica+organica+libro+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420240/normal_6025997cefb68.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/ejemplos_de_dialogos_cortos_entre_2_personas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369912/normal_5fc80e16c3978.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/fopazevivepebifosateka.pdfIn PDF document text
    • http://tapopapebesawu.getenjoyment.net/vimidikovizewupubiretu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379240/normal_603097d028a53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408871/normal_601480a2f0fd3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479435/normal_5ff0a9d1bfe82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391599/normal_5fd1c2906d5da.pdfIn PDF document text
    • http://kevogam.22web.org/tobev.pdfIn PDF document text
    • http://zatutajijiti.getenjoyment.net/merit_badge_pamphlets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368972/normal_5fd72354a99b9.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/80376611076.pdfIn PDF document text
    • http://relizebewugigad.22web.org/pevaxowinilomiwugekus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_600f3012307ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sonogobujajeva.rf.gd/55946779648.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_off0000cd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD26 5696 bytes
SHA-256: 1201a38fb60f509fb6d150c93f53139676d7212bc4ed4995d6dc39ae50fa4658
font_01_sfnt_off0000e068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE068 11296 bytes
SHA-256: 5610debfbf4bac37d60418f240ea879a72f242c2453070c10f4ddff86b60c69d

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