PDF malware analysis — malicious · 5ef60c9b3edd8d01

MALICIOUS

PDF

67.6 KB Created: 2021-02-18 05:28:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31

MD5: 1ea81b8601637aec5fa2b44970f41ad3 SHA-1: 78fbd732662c72d98b0e500d356081d1e4a0102a SHA-256: 5ef60c9b3edd8d017d0bd68706e86fb30dcebfdf088bef9e8cfedf2b0f3a07a9

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm for SEO manipulation or to distribute further malicious content. The presence of multiple external URIs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.8161

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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.
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.
External URI info PDF_URI

PDF contains an external URL action
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://leonvi.ru/aws?utm_term=nikon+dx+vr+af-s+nikkor+18-55mm+lens PDF link annotation
- https://sosedegif.weebly.com/uploads/1/3/2/8/132815053/mevoko.pdfIn PDF document text
- https://cdn.sqhk.co/moxibusas/INX2hjl/1295_horizon_drive_fairfield_ca.pdfIn PDF document text
- https://cdn.sqhk.co/nuwobevina/XRSRsSQ/tawit.pdfIn PDF document text
- https://cdn.sqhk.co/lilodipu/jdP4ibR/skillz_logical_brain_game_cheats.pdfIn PDF document text
- http://naturebiolog.fun/hospital_de_ranas_lorrie_moore93th9.pdfIn PDF document text
- https://cdn.sqhk.co/tiwopaperuv/gcQifhj/24734145043.pdfIn PDF document text
- https://cdn.sqhk.co/bupitagalir/gNpkngg/how_to_use_amiibo_super_mario_maker_3ds.pdfIn PDF document text
- http://upgrade4me.com/kufexololimixudatuxemexg7p9g.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4412570/normal_602dc7cb4131c.pdfIn PDF document text
- https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/3062342.pdfIn PDF document text
- https://getiwojaxewife.weebly.com/uploads/1/3/4/0/134012456/wuzapijapidimi.pdfIn PDF document text
- http://housefashion.ru/how_riddex_plus_worksogxzw.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f4a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4A8	5616 bytes
SHA-256: `1ac7c21e7b91011082c04ad7082919514c52aa6b0aae914a9dd1ad066f5085d2`

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