PDF malware analysis — malicious · c41af85187d7de4e

MALICIOUS

PDF

58.9 KB Created: 2021-01-11 15:52:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25

MD5: 5b741db976cbec7412486c75aa13fb7e SHA-1: ac498a681e0809614cdde62c868f9121c5e538e8 SHA-256: c41af85187d7de4ead2b97c7095c2832f0094ea6355a0676d6ca457c081da735

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to direct users to external websites. The document contains numerous external URIs, many hosted on disposable domains, suggesting a phishing or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to facilitate such redirects.

Machine Learning

Nyx PDF Classifier malicious score 0.7268

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://trafftec.ru/wb?keyword=strikemaster%20ice%20auger%20carburetor PDF link annotation
- https://cdn-cms.f-static.net/uploads/4386330/normal_5f8cbc71edc35.pdfIn PDF document text
- https://pawuxadatunu.weebly.com/uploads/1/3/4/2/134266652/9a97d973ca0839.pdfIn PDF document text
- https://foxesusonixuna.weebly.com/uploads/1/3/5/2/135298742/detaxoza.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4365567/normal_5f87096ef29b8.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4412183/normal_5fcaef6c35fc2.pdfIn PDF document text
- https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/pejamaxowuwefu.pdfIn PDF document text
- https://beluloxepivizor.weebly.com/uploads/1/3/4/1/134131295/cb320c0f9c5.pdfIn PDF document text
- https://wotutokope.weebly.com/uploads/1/3/5/3/135315373/tokabo_makiveges.pdfIn PDF document text
- https://sazefowefojewen.weebly.com/uploads/1/3/4/8/134893887/e938dd67d.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/febopa/vevadapokuwubov.pdfIn PDF document text
- https://s3.amazonaws.com/makumapikeze/livebavusafejarelelebopo.pdfIn 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_off0000c335.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC335	5396 bytes
SHA-256: `67aebb6fdc407e7197adbee1cf06948a90bd29fda9b78b9c6ff958fa409cde2b`

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