Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b82681744ae3844…

MALICIOUS

PDF

89.2 KB Created: 2021-01-24 10:57:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 540bd1590b0de445b710a221752e8f9b SHA-1: af55074ee6163c53a64afd9662d34cf083c4d94a SHA-256: 4b82681744ae38449045e0c64b4c44cb02fbead7bf7479ca0c299b4c380a2d2a
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, disguised as search results for a popular TV show. This URL is likely used to host a phishing page or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=masked+singer+season+2+episode+4+performances PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467561/normal_5fe08cf9a3115.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417405/normal_6003efe0ce08c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_5fdb7636ddf86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488317/normal_5fdbe289804a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463263/normal_5ff599ce5c094.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414156/normal_5fe25ab7913f7.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/tutapaxi/media_player_example_in_android_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/android_7._1._1_root_no_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/cardan_shaft_alignment.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/zitubolenagizusi.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/63507752958.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/66646101605.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/zodibis.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/63696627822.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/gopenakurafalove.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/cavernous_transformation_of_portal_vein_causes.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/romatuzela.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/veraxojizolividotovenod.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/muzasemesakedamij.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_off00010c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2B 5440 bytes
SHA-256: 8de2e8700d86af39434983be0d6f01db872dbd8c2aefc72de27e2a03907ea635
font_01_sfnt_off00011e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9A 13056 bytes
SHA-256: 901fd204ea43a325719856a80ef984ee3fb44e44cbd1ece60215c9bffa850631
font_02_sfnt_off000148d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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