Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e382d361e9d7ff…

MALICIOUS

PDF

74.4 KB Created: 2021-01-21 23:16:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 941d4eee00a444cb44e17982e9a7443c SHA-1: 53f239dd4fc2c4b3491ce691286f6b81dff5bb42 SHA-256: 26e382d361e9d7ff6a7fe2cbff67e8c4ff00b1298bd189cba1ec72668cd33460
202 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a malicious link impersonating Facebook, designed to trick users into downloading a "Korean grammar book". The link directs to a known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://gettraff.ru/123?utm_term=korean+grammar+book+pdf+free+download.
  • 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
  • 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://gettraff.ru/123?utm_term=korean+grammar+book+pdf+free+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4495691/normal_5fe7e7e50e3d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383302/normal_5fddb10908b2d.pdfIn PDF document text
    • https://cdn.sqhk.co/vipabure/UMd43Uy/87681142022.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404500/normal_6003f1c2e901c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_5fd7f7ba6f9ea.pdfIn PDF document text
    • https://cdn.sqhk.co/fofasafiwi/huic6jc/27862471372.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426262/normal_5ff37860d7f51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467593/normal_5fcaf93c6bdee.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/kavalukato/86427896757.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/67276489649.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/ambersil_air_duster_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/best_calendar_app_android_exchange.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/30321305681.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACD 3136 bytes
SHA-256: 57854f035c7cf00bfa735629c87a19897b0e2e04607e62327357c6699ef86b5d
font_01_sfnt_off0000e614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 5448 bytes
SHA-256: 6782d294deea815f2a6881de35ef5b4949871012569d5afaa24ac783d76eb86e
font_02_sfnt_off0000f89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 10504 bytes
SHA-256: c3c7aa4b65ec8ed588174005e1ea01ccf258ef55ccd8a6df58b0a24ee1f838b9

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