Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4ebc9b1b17efa2…

MALICIOUS

PDF

80.6 KB Created: 2021-03-04 02:02:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 278bac5a2257cb11232c58eaf3a1e316 SHA-1: 13f0fbc4654b1a3b2a3d9dcfefacaa9d9e72c71f SHA-256: 7f4ebc9b1b17efa2a77635d7ffa02b66b38f61426ef326c83d48c011ca00b6b0
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 0.9997

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://kuzutuzo.ru/123?utm_term=xln+audio+addictive+drums+2+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369486/normal_601328cb61849.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428054/normal_5fe57ca5d5d7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484999/normal_6025182deb9ad.pdfIn PDF document text
    • http://dazixetenulega.22web.org/joposefolosusikawaramawul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417528/normal_5feb07a84a2be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489407/normal_601b354305ad2.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
    • https://s3.amazonaws.com/xefezesebusu/30465817776.pdfIn PDF document text
    • http://zoletiwosi.rf.gd/mcgraw_hill_connect_accounting_answers_chapter_14.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/voxeguret.pdfIn PDF document text
    • http://towetugo.epizy.com/1709849825.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/big_little_farmer_unlimited_gems_mod_apk.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/metodologia_de_la_investigacion_cuantitativa_segun_autores.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/kelpy_g_sheet_music_piano.pdfIn PDF document text
    • http://melaworogafema.epizy.com/braum_rune_guide.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_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 5228 bytes
SHA-256: 36e01ab2b82c1b034851d77dcc587692e594804838043f687f09dad8a67e8b7f
font_01_sfnt_off0001031a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031A 10544 bytes
SHA-256: d908e33c7e00dc0277b4ad8673c1fb782ff71064ccb498b9bba6a78064da7f84
font_02_sfnt_off00012712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12712 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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