Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1831ed7760b52a…

MALICIOUS

PDF

65.7 KB Created: 2021-02-15 23:47:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f59aaa979ec644981f46a9c61389ae0 SHA-1: 1a8687ddae5e396634d70baaeb0c678a35e2981a SHA-256: cc1831ed7760b52ace02572f148d9cbef9e8146ae8a5b18c734497f4a5775f5e
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, one of which, https://maypoin.ru/wix?keyword=precalculus+mathematics+for+calculus+7th+edition+solutions+manual+pdf, is presented in the document body as a lure for a calculus textbook solutions manual. The presence of external URIs and the overall detection suggest the file is designed to trick users into visiting malicious sites or downloading further malware.

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://maypoin.ru/wix?keyword=precalculus+mathematics+for+calculus+7th+edition+solutions+manual+pdf
    • http://hookup157.online/tubirasijotifojizular9mgx.pdf
    • http://lnstagram-badge-verification.com/946180112622967k.pdf
    • http://idealica-italy.site/nadelofl5wn.pdf
    • https://cdn.sqhk.co/xamowizaso/xFjdzwB/54004187985.pdf
    • http://aycotoro7.xyz/cristalizacion_operacion_unitaria074r8.pdf
    • http://pollsexpert.com/que_es_el_dbo5bxbnz.pdf
    • https://cdn.sqhk.co/xuxozowaki/TjfiiaJ/hungry_pig_right.pdf
    • https://bivufinemena.weebly.com/uploads/1/3/1/3/131380184/7196230.pdf
    • http://tameeniraq.com/kadevurodirafudejjyova.pdf
    • http://kmplitka.shop/akira_manga_english6w3ql.pdf
    • https://cdn-cms.f-static.net/uploads/4388274/normal_6014d973ccf64.pdf
    • https://cdn-cms.f-static.net/uploads/4393637/normal_601b426fd30a4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pipovafalalum.rf.gd/netflix_apk_mod_ios.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c42e.bin
df6736dd18a20536c7835f731bda79d3deb7715ea174377cd2abc3e381a5fcff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC42E 5476 bytes
font_01_sfnt_off0000d6ad.bin
4b8536b26d0c711cf4d122e25b91c210f67a4390c0088f41339c23d0d2ecb68c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AD 10260 bytes

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