Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c3a65e6ef81bba…

MALICIOUS

PDF

76.5 KB Created: 2021-03-01 08:26:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 890e4776c6cfb1dd0bc69a22b1d66b1b SHA-1: 23bab31257ca0ae0968dd91503e6f21164b5598e SHA-256: b7c3a65e6ef81bba985dfeb938ea5617e3b916a2f7b7210a58a8f6e19643fdb7
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://zajinet.ru/123?utm_term=lusus+naturae+short+story+meaning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379476/normal_60138db3050db.pdfIn PDF document text
    • http://mainsale.info/fewununeramirozavu83p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498366/normal_5fe0e0fa698dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413705/normal_5fcf6adc4e17a.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/44809638147bgn4i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_603b3b06902d9.pdfIn PDF document text
    • http://hurricane1.space/how_to_answer_what_is_your_work_ethicnvmvi.pdfIn PDF document text
    • http://laluwaraselolar.mywebcommunity.org/caddx_nx8_wireless_programming_manual.pdfIn PDF document text
    • http://robinmani.site/gixugemngex0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417123/normal_5ffbd8b3879c9.pdfIn PDF document text
    • http://kadaxejob.mypressonline.com/flir_one_android_usb-c_thermal_imaging_camera_for_android.pdfIn PDF document text
    • http://motugisimugod.iblogger.org/31352228164.pdfIn PDF document text
    • http://storeplus.pro/wofuwoziwudopgbaso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dobubijopawuxon.epizy.com/38226848991.pdfIn PDF document text
    • http://kovusilo.epizy.com/91861300700.pdfIn PDF document text
    • http://xupaxemos.rf.gd/85384066249.pdfIn PDF document text
    • http://jexesomaw.epizy.com/navy_n_codes_n8.pdfIn PDF document text
    • http://tuvilijemuze.epizy.com/fozixinelekariwizokome.pdfIn PDF document text
    • http://lajofekozorofa.rf.gd/48242993122.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_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 5108 bytes
SHA-256: 884bc2a3747af2b25e0e864c8c5bab8ef0357cd192b0bce03a1f6be191ea058b
font_01_sfnt_off000100d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D5 10428 bytes
SHA-256: 5e94116adade84de586838cb8c8b523947e4575f8e5f75080d2480e2e7b93942

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