Malicious PDF — malware analysis report

Static analysis result for SHA-256 8687d39ca499c8c3…

MALICIOUS

PDF

74.4 KB Created: 2021-02-23 12:19:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5b524a17747f22a12fd959f2e86316b8 SHA-1: 5ac135bad54666a9bc18db2aa9853e48b5862e40 SHA-256: 8687d39ca499c8c331e54bd8f984ab11d3735d792a0a64517838f65fbe440014
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/123?utm_term=jet+jj-6csx+review PDF link annotation
    • http://merovew.xyz/jibjab_free_account_loginwezjl.pdfIn PDF document text
    • http://rawenspant.online/92885053761ykkpz.pdfIn PDF document text
    • https://kakowafalajoji.weebly.com/uploads/1/3/4/4/134455686/filazifox_katinaga_nineti_fixewo.pdfIn PDF document text
    • http://respect-ltd.su/arsenal_vs_man_utd_match_report83j1l.pdfIn PDF document text
    • https://dexulivixuwe.weebly.com/uploads/1/3/0/7/130739852/fesimezamamor.pdfIn PDF document text
    • https://lepoboniw.weebly.com/uploads/1/3/0/9/130969744/8c5f3ee3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5fdbe22080988.pdfIn PDF document text
    • https://jerewerek.weebly.com/uploads/1/3/5/3/135349205/nunizo.pdfIn PDF document text
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/vubeburexa_gadafug_ferukivakenegu_pasuxag.pdfIn PDF document text
    • https://ximavubakalik.weebly.com/uploads/1/3/0/7/130776508/9612652.pdfIn PDF document text
    • https://cdn.sqhk.co/nadetajagupe/clgfvyc/2020_land_rover_defender_configurations.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403422/normal_60036059c4b79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72F 5020 bytes
SHA-256: efd88d563481ecdb43380951f85d8a7b1f9fe613ab25672210b7afeb20f1f4f1
font_01_sfnt_off0000f878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 10764 bytes
SHA-256: 0278ece45e33424044ad6b73badf22fd6d448565431f42685ad992c394ecbdd0

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