Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6505eb9f08b509e…

MALICIOUS

PDF

70.0 KB Created: 2021-03-25 15:45:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dbb902264b16e97ef35fea55ab6cbd0 SHA-1: a9143722ff2612ff59ed8e889e7f1bdbcdafec5e SHA-256: a6505eb9f08b509ed5447783d4577c1102fba747e66e2e9733b631fff2958ea7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/123?utm_term=greenhouse+effect+ppt+free
    • https://kimuremosov.weebly.com/uploads/1/3/4/7/134732255/7046344.pdf
    • http://13millions.store/deoband_weather_reportbg78t.pdf
    • https://cdn.sqhk.co/loganidob/yuIljhj/air_cooled_water_chiller.pdf
    • https://cdn.sqhk.co/vixukose/i2ihEgd/zibananejurozepe.pdf
    • http://kushtanash.ru/gusozalesirokabuvilubilaim3u.pdf
    • http://sberbank.services/71996046881x6ba8.pdf
    • http://xxlmature.site/dotuwevibemadufahwozv.pdf
    • https://cdn.sqhk.co/vibisidumes/gZkfNib/80399867238.pdf
    • https://cdn-cms.f-static.net/uploads/4420588/normal_601fb6d8d9f64.pdf
    • https://cdn.sqhk.co/jisepozidis/Khbhexy/55178673842.pdf
    • http://belkwigs.com/96124607856oa0ju.pdf
    • http://golden-charm.ru/37199583429rlevy.pdf
    • https://cdn.sqhk.co/jubawiwa/bjhijSK/humungousaur_coloring_ben_game_book_10_download.pdf
    • https://cdn.sqhk.co/muvetowiripa/jiicmgi/pegusazodagufovaniwo.pdf
    • https://cdn.sqhk.co/bomikiwolug/hhhi5hb/33642566928.pdf
    • http://canonsburglake.org/math_worksheets_multiplication_table53jkd.pdf
    • https://cdn-cms.f-static.net/uploads/4475859/normal_6041c530981d8.pdf
    • https://cdn.sqhk.co/guwuweri/1b9D2jh/hello_granny_horror_craft_maps_apk.pdf
    • http://fullpisetc.ru/10233913258p9lox.pdf
    • https://zizeximafebofiz.weebly.com/uploads/1/3/4/3/134369397/6fe0a07.pdf
    • http://eroganoficial.site/maravilloso_desastre_libro_descargarda625.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000d554.bin
19f6437f68f7c05b7233612dc688e167e69d41751f14026c260977828ebc8a74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD554 4892 bytes
font_01_sfnt_off0000e5ff.bin
1ed161062acbc73557dfa5b0f18e26ddc3d28dbab5ca3e68a69475e5608731ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FF 10668 bytes

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