Malicious PDF — malware analysis report

Static analysis result for SHA-256 775c69bf70afb949…

MALICIOUS

PDF

73.8 KB Created: 2021-03-02 21:27:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9ca4e6cd6bba02a767101ba7798dc30 SHA-1: 9343814dca3126602941af7376ed6ff4cf32a27a SHA-256: 775c69bf70afb949dc2791454c2bc7f7c236da33dbd34b545a69f932b4ad161f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a direct link to an executable payload hosted on 'golowaki.ru'. This heuristic firing, combined with ML classification and ClamAV detection, strongly indicates malicious intent. The document body, though heavily obfuscated, appears to be a lure related to Korean dramas, likely to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF link points directly to executable/archive payload critical PDF_DIRECT_PAYLOAD_LINK
    PDF contains a clickable HTTP(S) URI whose path ends in an executable, script, shortcut, disk image, or archive extension. Documents can legitimately link to installers, so this is a high-risk delivery indicator rather than a standalone exploit fingerprint.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=phim+bo+han+quoc+xomgiaitri.com
    • http://menbp.online/52013591833zv5iw.pdf
    • https://cdn.sqhk.co/fidegelotag/1icRijb/best_sd_card_reader_for_iphone_11_pro.pdf
    • https://cdn.sqhk.co/jagibuvat/ghwdLdO/lightsaber_chopsticks_ebay.pdf
    • https://wuzezabor.weebly.com/uploads/1/3/1/4/131438899/96d924576bcde7.pdf
    • http://rajonilelubej.22web.org/fipufutifinelinudef.pdf
    • http://dotixomovi.sportsontheweb.net/50875661062.pdf
    • https://kapelasijad.weebly.com/uploads/1/3/4/3/134312752/3460640.pdf
    • https://cdn.sqhk.co/zebenane/jeYbCie/14167021328.pdf
    • https://static.s123-cdn-static.com/uploads/4369653/normal_5fca7507dd7d7.pdf
    • https://cdn.sqhk.co/surodamiz/idlfp8q/ballistic_missile_meaning_in_tamil.pdf
    • https://videxopejevis.weebly.com/uploads/1/3/5/3/135333638/zojufalaj_vufar_lejuwepefot.pdf
    • http://mp4.design/visaraxizuvunogke83.pdf
    • https://silavetej.weebly.com/uploads/1/3/5/3/135314504/kogepi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pitowexenijodez.rf.gd/wuror.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_off0000e4db.bin
b0c9f21bb9ce63de3241a3e70ff9f9a494e6f9901d4cda7a49b9a6a7e9dbc0ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 5372 bytes
font_01_sfnt_off0000f6fe.bin
d7032b63ee6e5ed108843d136c28b573b8d25815a2a1671b6a7feafa3142a4bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 10424 bytes

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