Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f2bcd2ee9faf87…

MALICIOUS

PDF

75.3 KB Created: 2021-04-07 19:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 41c9d51fa7f43a1770f5d41e73800e57 SHA-1: d4ac98b7477c95aae9ad8a88028f93e80f183fc0 SHA-256: b9f2bcd2ee9faf8786e0ac1d53b94a42af418ea05c2f53d4c611bba0467a9d90
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-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://golowaki.ru/123?utm_term=airline+tycoon+4+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388814/normal_600ba9d61e8d9.pdfIn PDF document text
    • http://gajuduxotam.iblogger.org/zudowujajosogakamoju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463009/normal_60493a037fbb6.pdfIn PDF document text
    • http://legendbilisim.com/tixopatosarakujucr3xt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448124/normal_60544a9230d61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388041/normal_5fe19bd8c577b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383695/normal_6008e9e2a1cc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382192/normal_60546e31a5e68.pdfIn PDF document text
    • http://glasshookahcatering.com/modaxijupapikofemm0u0s.pdfIn PDF document text
    • http://cccckkkkkdd.space/guidance_value_bangalore_2018-19ncb8z.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/45060584041.pdfIn PDF document text
    • http://risonubokedoxav.scienceontheweb.net/castrol_magnatec_stop_start_0w30_d.pdfIn PDF document text
    • http://wivevadevenumet.mywebcommunity.org/22820089076.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bomemab.epizy.com/32743466908.pdfIn PDF document text
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_f912f9a13b87479a938740e8adef3162.pdf?index=trueIn PDF document text
    • http://sasaxunofob.atwebpages.com/tusipaz.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_721d55337f6a4cc9be682c1b55eac403.pdf?index=trueIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_67ce7108ee5a41d49c107ef7d2fd5331.pdf?index=trueIn PDF document text
    • http://lojubefogugiku.onlinewebshop.net/visual_basic_programming_tutorial.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_off0000e9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B7 4992 bytes
SHA-256: 2d02e05392aadb29960d9f01ea82cf91ca50b9180d320b098c5abaeb8ac144a9
font_01_sfnt_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 10940 bytes
SHA-256: 22d90d780f7afba0787086e6d332153e4553b7c3038737ad6ef960807a4db20e

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