Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce87e9db61744807…

MALICIOUS

PDF

75.7 KB Created: 2021-03-16 10:00:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b7c1720e32c40877119f7238f409adec SHA-1: 981626af0f4e8505a8a1fe7c84e9c0cd7fcd9e66 SHA-256: ce87e9db617448079dc84d8b3be965e5451f3dd126809cf73844417ee15c0f13
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://nipisod.ru/strik?utm_term=weighted+straw+cup+leaking PDF link annotation
    • http://patajafurep.mywebcommunity.org/what_does_dysplastic_nevus_mean.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418191/normal_5fe6bc48c415e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500438/normal_6030981e3b751.pdfIn PDF document text
    • https://cdn.sqhk.co/nulojokine/hhi2Eji/fejapexalupedixapurusela.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478402/normal_60462d65c4513.pdfIn PDF document text
    • https://biwezufum.weebly.com/uploads/1/3/4/8/134872286/1261882.pdfIn PDF document text
    • https://cdn.sqhk.co/xomatujod/WOhhUm5/81274467388.pdfIn PDF document text
    • https://lutovadefok.weebly.com/uploads/1/3/3/9/133997447/nosonew-wisuwe.pdfIn PDF document text
    • http://tuderoba.getenjoyment.net/base64_encoded_in_html.pdfIn PDF document text
    • http://fogugevup.22web.org/arcaea_mod_apk_2._3._2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495846/normal_604975cb86c92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462732/normal_5ffa54f1931e6.pdfIn PDF document text
    • https://cdn.sqhk.co/tovitaxani/idAv2id/gazefepadugowu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vubelifijam.atwebpages.com/towiwasukadezutopanowixef.pdfIn PDF document text
    • http://jezirateba.rf.gd/is_the_shark_vacuum_any_good.pdfIn PDF document text
    • http://mugazukadum.onlinewebshop.net/runodekokuzarumipowexonej.pdfIn PDF document text
    • http://zijiwaras.onlinewebshop.net/89200750387.pdfIn PDF document text
    • http://lupemuvuxetamok.epizy.com/35780278714.pdfIn PDF document text
    • http://bujijawuta.atwebpages.com/kufufewiz.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_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 5504 bytes
SHA-256: 01420fca10a1282c2fa4e8f0366f24eb4d923c89e2fb516b5a52e59544a0ba3b
font_01_sfnt_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 10672 bytes
SHA-256: ef38b4a1abbec64f72d13193472d69cf552f7786d4df5d0952b62800daa35051

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