Malicious PDF — malware analysis report

Static analysis result for SHA-256 10dd52213c2ed166…

MALICIOUS

PDF

79.2 KB Created: 2021-02-24 17:44:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 783ffbce5f13bedd11418815ed121985 SHA-1: 29738e6761d312e03bdfaae29c88c0a128088b3c SHA-256: 10dd52213c2ed166e9b96badce63135ad2423134292f585232ce6d993a7ebe95
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely intended to redirect the user to a malicious site for further exploitation or credential harvesting. The document body, though heavily obfuscated, appears to contain text related to exercises, serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/strik?utm_term=muscular+strength+exercises+at+home+without+equipment PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486565/normal_60234ed84152c.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/vudegibuzezemejubak.pdfIn PDF document text
    • https://nelizebowi.weebly.com/uploads/1/3/4/7/134734992/duvaxapinufubudaja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449779/normal_5ff381c496dab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366044/normal_5ffc5651e0064.pdfIn PDF document text
    • https://numuladak.weebly.com/uploads/1/3/4/6/134613837/4e9302f1b8c89d.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuxuvop/Zhcjiif/zojagipilanufugamele.pdfIn PDF document text
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/45f1f2.pdfIn PDF document text
    • http://timinome.getenjoyment.net/3706338708.pdfIn PDF document text
    • https://bobilemako.weebly.com/uploads/1/3/4/7/134733435/niwagam-rukoje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423155/normal_5fca93a13523c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415534/normal_5fdedd8639b40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415292/normal_5fc9eba7460e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380707/normal_5fd625bcd5eee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453550/normal_6029891e71299.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/ximupuv/whirlpool_quiet_partner_iv_wont_turn_on.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/juxawelejepigazupakenive.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/71862460962.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/70555561493.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_off0000f916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF916 5640 bytes
SHA-256: 24e5530194adad2dc7c241ff0456c7a99b2d665998287a7b8c6b0ed3a766a8ce
font_01_sfnt_off00010c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3B 10192 bytes
SHA-256: 4adec97b7b850050dc593ba665e5a8cb8e113ee92da79e437608a0233b254d9a

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