PDF malware analysis — malicious · f9d6243304fcc6be

MALICIOUS

PDF

77.1 KB Created: 2021-01-17 12:34:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12

MD5: ca5f748898da3b242a058bdec7a08fbd SHA-1: c2148368521ee526102de56a8c6f42889f797b09 SHA-256: f9d6243304fcc6be7dd0730d216f79a2606b8086e9832eb7e0dbed111b50221b

252 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of links to external PDFs hosted on disposable domains, indicating it functions as a link farm. One critical heuristic identified links to known malicious redirector infrastructure, and another flagged it as a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 7

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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 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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://traffmen.ru/aws?utm_term=alfresco++as+zip In PDF document text
- https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/9128093.pdfIn PDF document text
- https://cdn.sqhk.co/fawabanof/Km1ehab/zobukiveregedoj.pdfIn PDF document text
- https://gosaronazaniga.weebly.com/uploads/1/3/4/8/134851605/vurane_lijitoxateso_sekebemibunevip.pdfIn PDF document text
- https://muxuredoli.weebly.com/uploads/1/3/1/3/131380086/todisosakidatosagab.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4454990/normal_5fe6cfb3aa44c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4393626/normal_5f9817ebb0a26.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366043/normal_5f873a7f7ee06.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4466146/normal_5fd660054b684.pdfIn PDF document text
- https://cdn.sqhk.co/xakatikakizi/iaggogJ/today_s_weather_forecast_please.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4467573/normal_5ff9443b1d1b9.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4407782/normal_5fd7dd0b10e0c.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4499002/normal_5fe0b42c54c08.pdfIn PDF document text
- https://losiweso.weebly.com/uploads/1/3/1/3/131380476/vafarigajotujuj-pefajikanaxelu-rufejalopo-dunobuwiwaxo.pdfIn PDF document text
- https://kibugaduxabe.weebly.com/uploads/1/3/4/5/134510017/2434ff18d.pdfIn PDF document text
- https://cdn.sqhk.co/daboxazile/oboc5gh/coronavirus_domino_effect_meme.pdfIn PDF document text
- https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/6847128.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/tuxenipup/sugamupapijojitidurikew.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ee4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE4D	5048 bytes
SHA-256: `92360950f6ec5f0e3c9d65ab2c1353e23ce09d8b4116b21de8b2f53012637e6a`
`font_01_sfnt_off0000ff99.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF99	12248 bytes
SHA-256: `ffd7292cb08ee70a72051e236567f213a3d1b70ca0ff82a356bc6c2ddf92fb16`

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