Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcb6bf02715d6c8…

MALICIOUS

PDF

76.8 KB Created: 2021-03-04 23:54:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1b19ecb7e2f3efb5639a531a3e91504c SHA-1: 9ce0f945bd65abc09745e5af414299a2fad96b61 SHA-256: ffcb6bf02715d6c8e51109e09e85b8032e06ec0b82ef1d5743852f7ee2b0851d
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 0.9993

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://druttle.ru/123?utm_term=let+all+things+now+living+sheet+music PDF link annotation
    • https://cdn.sqhk.co/lekibapufe/e4Kh4JS/view4view_pro_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378856/normal_5fe890369530d.pdfIn PDF document text
    • http://xujosigij.iblogger.org/21327734304.pdfIn PDF document text
    • http://grenkasalo4.xyz/60590338073xzrw5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484641/normal_5fce9732b5ff4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382976/normal_60413d5b683d5.pdfIn PDF document text
    • https://cdn.sqhk.co/kokademesuz/jk0BPrn/free_robux_generator_for_roblox_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421768/normal_5feb88f661ec7.pdfIn PDF document text
    • http://tidedejix.iblogger.org/anti_stress_games_android.pdfIn PDF document text
    • http://vuzetasavuxoso.mygamesonline.org/avaya_one_x_agent.pdfIn PDF document text
    • http://haustova.com/mikiwetunokeduwiveku3preg.pdfIn PDF document text
    • http://requiremcgood.com/112628443146o29e.pdfIn PDF document text
    • http://siwarezowagi.iblogger.org/85693002611.pdfIn PDF document text
    • http://boost-shop.xyz/642543939973dir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476947/normal_5ff8876b8dbdc.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/jfWCpie/free_game_recording_software_for_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/ejinVjg/biluro.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/jgdUgk3/adobe_editor_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liroporuki.myartsonline.com/fluke_networks_linkrunner_at_2000_firmware.pdfIn PDF document text
    • http://reluwiz.epizy.com/85256011916.pdfIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/xesefasizabotujuto.pdfIn PDF document text
    • http://ravuxigud.epizy.com/baseball_shirt_design_template.pdfIn PDF document text
    • http://xusijaxux.rf.gd/dopeguwavijitu.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_off0000ef6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 5208 bytes
SHA-256: d6c28f5d8c11a4b27fa8af68fa750319c46ae92e417c93b0dd499fbf5844ff15
font_01_sfnt_off00010122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10122 10684 bytes
SHA-256: b41ee28c1c36537b9c2cbfff27dff3929fd6c92575a844e3a923a04ec2c20bcd

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