Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb202f6a2a8d9643…

MALICIOUS

PDF

106.0 KB Created: 2021-03-01 15:46:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4be78feaa103c0e18c3c2853fd444cd9 SHA-1: ebfe641dc4a0793933f1aec92f583efe5e442a27 SHA-256: bb202f6a2a8d96433f325b5afc6f371dac98d835ec8c4e1eecf9aa617d0d5062
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm designed to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/123?utm_term=how+many+ranger%2527s+apprentice+books+are+there
    • https://static.s123-cdn-static.com/uploads/4375356/normal_5feb20a05e25d.pdf
    • http://richmaya.site/tiruposapezikajewej5ghm.pdf
    • https://static.s123-cdn-static.com/uploads/4455883/normal_5fec22a2dbac6.pdf
    • https://cdn-cms.f-static.net/uploads/4369915/normal_601dbde1df0af.pdf
    • https://vewiwuxipax.weebly.com/uploads/1/3/2/6/132681682/jugefutis_xesisemejaduwi_datozutenupefu_kanapil.pdf
    • https://rizenuwav.weebly.com/uploads/1/3/4/3/134335920/giwumikaved.pdf
    • http://vuzuwul.getenjoyment.net/51600922373.pdf
    • https://static.s123-cdn-static.com/uploads/4392861/normal_5fef446308cbd.pdf
    • http://flathead.us/133586009301hems.pdf
    • https://xitosuwoga.weebly.com/uploads/1/3/3/9/133988858/4079319.pdf
    • https://jelisewisu.weebly.com/uploads/1/3/1/4/131410299/bududusibevab.pdf
    • https://nugenezeni.weebly.com/uploads/1/3/4/6/134632238/debodegirave.pdf
    • https://nigikejogu.weebly.com/uploads/1/3/4/9/134902550/ribelonerupuf.pdf
    • http://instapriz.site/seal_lullaby_piano_sheet_music_freetbjwb.pdf
    • https://fixabewol.weebly.com/uploads/1/3/4/7/134711766/799890.pdf
    • https://bexejasofipa.weebly.com/uploads/1/3/1/3/131397997/xetuxaginaw_sufusalug.pdf
    • https://cdn-cms.f-static.net/uploads/4390663/normal_5fd7f82486268.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vunonam.atwebpages.com/11056239682.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_off00015f8b.bin
747ee2036cd137370465a652c50e8a2cbb80a7d9af8c188d3de5bcedf5089d4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F8B 5708 bytes
font_01_sfnt_off000172ef.bin
67f3216b916b111e95e159edc1351cd9a155755909284d532d7ead28658a2bf0
pdf-font-stream PDF embedded font (sfnt) at offset 0x172EF 11624 bytes