Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce2bd73bf0c65bd…

MALICIOUS

PDF

74.6 KB Created: 2021-03-12 14:09:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b5e44ea508a28824d23b1f91599adc90 SHA-1: d3cd670671006de6f3f9a66196a0ccaa3a35e6ff SHA-256: 9ce2bd73bf0c65bdb200f0713a65a76684b841737e103171a749ac487d4c7c5e
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 0.9996

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://fokemale.ru/wix?keyword=chapter+15+study+guide+periodic+table PDF link annotation
    • https://cdn.sqhk.co/wovudojemu/pcujghf/adobe_reader_9._3_2_free.pdfIn PDF document text
    • http://pesale.pro/fibigowotutobokivalrum93.pdfIn PDF document text
    • http://ludshop.xyz/pubowusuluzujumezisewext7jv.pdfIn PDF document text
    • https://jinobodusere.weebly.com/uploads/1/3/4/7/134722577/154464f2a.pdfIn PDF document text
    • https://cdn.sqhk.co/xisalaximel/fjcuZ8S/56481938747.pdfIn PDF document text
    • https://jusopusoguwukul.weebly.com/uploads/1/3/4/4/134494455/nubasolamu-tokupukiririj-tugog-temeletuxux.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/fiejbmB/lego_hidden_side_sets_2020_summer.pdfIn PDF document text
    • http://krokoboko6.xyz/unreal_engine_4_programming_guidek2giq.pdfIn PDF document text
    • https://kozenuxifojani.weebly.com/uploads/1/3/4/6/134665776/mepam-tewevek.pdfIn PDF document text
    • http://top-salez.site/defense_game_pc_freeuyqpf.pdfIn PDF document text
    • https://rejosunofefi.weebly.com/uploads/1/3/0/8/130874376/5381452.pdfIn PDF document text
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/kalopabejorikebowij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/49884714153.pdfIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_f8aa4887442343238b031195572d20e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac3a4254-e03d-4566-9669-8bee1b5d6868/74366270714.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_a4e5ef9945f2484b9cf5f8e8049a4cba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8629be2a-8eca-4542-9675-00c664cda019/74700610976.pdfIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_975246c6a4f14ea0a3feab650102f3f6.pdf?index=trueIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_ebe825bfcd19412cb382da88c0b16118.pdf?index=trueIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_5cf203819f094d5cbb409a548e2e4f26.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/kiwi_browser_apk.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_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 5660 bytes
SHA-256: 54ec493dd15b86e9fc78666e1faaa722b75ffeff7cb7d85d6acf2e8ffb759570
font_01_sfnt_off0000f978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 10284 bytes
SHA-256: ea1aa18cb394eda12285ebd61e0c08a7764e766204936e3eb01ac943c25753bc

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