PDF malware analysis — malicious · c6046cd6691f5f8c

MALICIOUS

PDF

80.7 KB Created: 2021-02-16 03:03:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03

MD5: 11b7dd3150a992383c5c719f8bb8425e SHA-1: 2b8ea9725f545c891cec676c3966d1a8d940c77a SHA-256: c6046cd6691f5f8c471c80802cd24c7678e797fbc9722c638f2419a251ad2b53

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to mathematical equations, likely to trick users into clicking the malicious link.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
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/strik?utm_term=how+to+write+an+equation+into+slope+intercept+form In PDF document text
- https://cdn-cms.f-static.net/uploads/4408721/normal_600b9263276d5.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4474752/normal_5fe5ac13136ed.pdfIn PDF document text
- https://cdn.sqhk.co/zadoweferoxe/cijxRjd/wukixewutenopetibuv.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4374024/normal_601f04cf8a6a0.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4428061/normal_5fcf5d1bb0d42.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4390095/normal_600456543ddb3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4387040/normal_5fe7a9561a030.pdfIn PDF document text
- https://cdn.sqhk.co/lepudijazur/3gdgejg/jexowivuzasulide.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4426944/normal_6022d21cd7f0a.pdfIn PDF document text
- https://cdn.sqhk.co/jekurona/jPkB9jc/century_21_store_hours_brooklyn.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4485800/normal_5fdd5b787c481.pdfIn PDF document text
- https://cdn.sqhk.co/tategupet/jjWGJpW/robots_coop_apk_ios.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4421637/normal_5fcd929129afe.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4411683/normal_5fdc2c3fc15d6.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- http://pivirujifija.epizy.com/32815048727.pdfIn PDF document text
- http://dujisuga.epizy.com/aws_elasticache_cloudformation_template.pdfIn PDF document text
- http://pasivete.epizy.com/97958102030.pdfIn PDF document text
- http://resibifamopoto.rf.gd/bitstream_font_navigator_2006.pdfIn PDF document text
- http://wafitiw.epizy.com/i_ready_answers_level_d_reading.pdfIn PDF document text
- http://tutivute.epizy.com/lasekisobak.pdfIn PDF document text
- http://xetorofowuwid.epizy.com/tuluxavusufekax.pdfIn PDF document text
- http://kanisal.epizy.com/73673555687.pdfIn PDF document text
- http://jerananixakuzeb.epizy.com/66964523592.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000edb6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDB6	5220 bytes
SHA-256: `43aebf943ec1a6b6890bfeaaf023f3b4e2a6c8c93c072bf00d2c6e6c71b52e3f`
`font_01_sfnt_off0000ff70.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF70	11464 bytes
SHA-256: `c67162efc2880d287dd4c9b64b2b96ca87c5d489252f3d9ef037bae062caa101`
`font_02_sfnt_off0001266a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1266A	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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