PDF malware analysis — malicious · 1ffbc72e0d1f4cdf

MALICIOUS

PDF

61.6 KB Created: 2021-01-14 10:32:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16

MD5: 1198e19a25f17ada14f4f08188e30314 SHA-1: e85491d524fb8951dafd271bfab7fc9c07ffdb1f SHA-256: 1ffbc72e0d1f4cdf5eab7086937b855ef116408cde9745526e7d63652ad6cab3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which appear to be part of a link farm designed to drive traffic to various websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO manipulation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9984

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
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.
External URI info PDF_URI

PDF contains an external URL action
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://trafffe.ru/aws?utm_term=king+single+flannelette+sheets+kmart PDF link annotation
- https://cdn-cms.f-static.net/uploads/4366982/normal_5fa1174b27cb2.pdfIn PDF document text
- https://site-1176177.mozfiles.com/files/1176177/never_have_i_ever_questions_college_dirty.pdfIn PDF document text
- https://jumirusuvowelu.weebly.com/uploads/1/3/4/6/134632856/6077323.pdfIn PDF document text
- https://cdn.sqhk.co/loxepafigav/gjgcjfk/pipupepugisufetimo.pdfIn PDF document text
- https://cdn.sqhk.co/fovipobex/hchh1jc/80425808236.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/zagapaxa/28951063241.pdfIn PDF document text
- https://s3.amazonaws.com/tibitexil/67348353683.pdfIn PDF document text
- https://s3.amazonaws.com/lanowilovuviwib/16419125391.pdfIn PDF document text
- https://s3.amazonaws.com/titugome/16064685010.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_off0000b48d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB48D	5212 bytes
SHA-256: `03cd91a3704a8acd26e5b9f08ca4ce0964ad6c0a2e52db5f0dda5476b440c3d9`
`font_01_sfnt_off0000c626.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC626	10632 bytes
SHA-256: `f13bc9f56ea4c22ceec59e05428b67dbb06243f8491da978beaf442a82bdb1f0`

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