PDF malware analysis — malicious · 37b0a7f6f33f395c

MALICIOUS

PDF

76.1 KB Created: 2021-02-15 10:54:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 3db7c731b174fef91405e36250e96ffc SHA-1: 5890252fa00c8b54bcd3e177a7e85ca1ec880a2c SHA-256: 37b0a7f6f33f395c1c44f0444d8f60674a6ef9fca8f7fcc13c15151ea5ce2ce0

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'yafferge.ru'. ML classification and ClamAV also flagged this file as malicious. The embedded URLs suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. No scripts were extracted, but the presence of malicious URLs is sufficient evidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 4

PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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://yafferge.ru/123?utm_term=they+say+i+say+chapter+2+summary
- https://cdn.sqhk.co/fopikudapom/cU4V9kQ/media_markt_gutschein_auch_im_saturn_einlosbar.pdf
- https://cdn.sqhk.co/lulaxujik/bCRCgjw/dinosaur_world_map_wallpaper.pdf
- https://cdn.sqhk.co/mukibusu/jgiT0hh/pikoje.pdf
- https://cdn.sqhk.co/pijavagoke/jgjdv29/gavegupiz.pdf
- https://static.s123-cdn-static.com/uploads/4426541/normal_5ff4d44b72865.pdf
- http://thecabinets.xyz/95945370934m71ko.pdf
- https://cdn.sqhk.co/zikegasenar/dhdvdgi/carx_drift_racing_xbox_one_code.pdf
- http://de-bewertung-id2842384.icu/wutuvafimokiwe35at6.pdf
- https://static.s123-cdn-static.com/uploads/4416921/normal_5fdf977e6be19.pdf
- https://cdn.sqhk.co/wiwevini/7ibqK0L/xifidakesufope.pdf
- https://cdn.sqhk.co/lexoxuxoluvi/92hawNs/roidmi_smart_car_charger_3s_bfq04rm.pdf
- https://cdn.sqhk.co/silinetufid/gyhbGo3/zijigodedisumogupizudowa.pdf
- https://static.s123-cdn-static.com/uploads/4366405/normal_5fff8064cde03.pdf
- https://cdn.sqhk.co/tubafejog/7jh89nt/pinikibotupotasibirij.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ea02.bin` `ac89c4ceb1d1e308d19ff1f371de672f44614da58ad7c115ae3b5df341309e27`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA02	5324 bytes
`font_01_sfnt_off0000fbfa.bin` `d770ab80c85ad2af7d2fbe64df71401d1b58572982aa1b58db16c09f957645ca`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBFA	11728 bytes

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