PDF malware analysis — malicious · 774b92cadfdf7b5e

MALICIOUS

PDF

69.6 KB Created: 2021-01-09 22:59:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 94bb992905be644965b4fd4faffd02f9 SHA-1: 925203890db1c0435f108ca6897b5c0bb419e012 SHA-256: 774b92cadfdf7b5e0df3e873826a458b42e09cc8a02505a02ea71add67014dde

242 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The ML classifier also flagged this PDF as malicious, and ClamAV detected it as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs points towards a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9241

Heuristics 5

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.
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 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.
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://cctraff.ru/aws?utm_term=exhibitor+manual+meaning
- https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/voxexinelosiremejas.pdf
- https://nonexivibofopuv.weebly.com/uploads/1/3/4/6/134603010/d75c08e0.pdf
- https://jubekufolofifi.weebly.com/uploads/1/3/4/5/134593927/9562083.pdf
- https://kowawixuru.weebly.com/uploads/1/3/4/5/134509215/xovilufateg_ridanipowelam.pdf
- https://kuvikupomudu.weebly.com/uploads/1/3/4/4/134457818/wanerafisa_zibeki.pdf
- https://site-1167993.mozfiles.com/files/1167993/16989623144.pdf
- https://kipujoguburaza.weebly.com/uploads/1/3/4/3/134321983/4527958.pdf
- https://fiwozipuwawew.weebly.com/uploads/1/3/0/8/130814157/8eb680f00.pdf
- https://gogodelile.weebly.com/uploads/1/3/0/9/130969080/nefivevolu.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/mijedusovineti/16457154099.pdf
- https://s3.amazonaws.com/verirejon/33877289321.pdf
- http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e803.bin` `4b88b5bb1350291582b3bc3b8d5d36da06d5d2d566e08c6481f3413e4e82274b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE803	4968 bytes

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