Malicious PDF — malware analysis report

Static analysis result for SHA-256 c134f10fc37bb167…

MALICIOUS

PDF

81.4 KB Created: 2021-02-19 02:30:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a3edd6305d828693605644cb89b7e0ee SHA-1: c3f5f2acc92afbec1e2c7e6efa20af28c3c3abc0 SHA-256: c134f10fc37bb1677f795a9c781d722ab418ffebdd18512538020d498cf3b10d
174 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/wix?keyword=apk+downloader+extension+v3 PDF link annotation
    • https://cdn.sqhk.co/kuzosexiwugu/hgcTQcO/43806598229.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/33447924774o4k9e.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuwomu/hjfihP6/juventus_news_24_app.pdfIn PDF document text
    • https://cdn.sqhk.co/bavomizobe/jfBFiiw/management_fundamentals_7th_edition.pdfIn PDF document text
    • http://eeeeeyyy.space/comptia_security_sy0-501_test_questions68g5o.pdfIn PDF document text
    • https://cdn.sqhk.co/pijuvedozuw/qDggjoC/86173923858.pdfIn PDF document text
    • http://hookup682.site/formule_simple_chute_de_tensionu1fhi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380854/normal_60126fe1dec5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466146/normal_5fd66065ba7c7.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/hjhgYYC/joraxobeb.pdfIn PDF document text
    • https://cdn.sqhk.co/bifoligi/XdjdQVf/15474186537.pdfIn PDF document text
    • http://idealica-ituficiale.website/kitagefufomotm1sfp.pdfIn PDF document text
    • http://tohld.in/how_to_run_a_retail_business_ukmne0r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/juvetaso/construction_tender_evaluation_criteria_template.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/bobinage_transformateur_de_tension.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/74273931312.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD17 5176 bytes
SHA-256: f73304af0fd7fe8052564fdac400bbf8b478ea10ac4ac884ba5007414020cb84
font_01_sfnt_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 10752 bytes
SHA-256: 08d5aa16dddc519ae182f89e888d7ed9869f160ecea4911973104d9330aea994
font_02_sfnt_off000113cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CD 16036 bytes
SHA-256: bc1c1644e30597ae0beaac312b9749a82b64e26c109397326cdc67fdbaf2fe17
font_03_sfnt_off00012834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12834 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

Open this report in the interactive analyzer, or submit your own file for analysis.