PDF malware analysis — malicious · 371dd7cbd3dfc9df

MALICIOUS

PDF

67.8 KB Created: 2021-01-02 16:41:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 00db21a3be029ad92c3971fa092fe24d SHA-1: e8c1d116a6f40d4c82ae23b25b04d483e8e41453 SHA-256: 371dd7cbd3dfc9dffc23672871057416fbe28a323b3c43eebbe1dbf2bd05e97f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many of which point to PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://trafftec.ru/123?utm_term=android+lollipop+launcher+apk+free+download', indicates a lure for downloading an Android launcher, likely a pretext for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 5

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
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://trafftec.ru/123?utm_term=android+lollipop+launcher+apk+free+download
- https://static.s123-cdn-static.com/uploads/4476751/normal_5feccf1f3e0d4.pdf
- https://cdn-cms.f-static.net/uploads/4368982/normal_5f9b5f71eed06.pdf
- https://cdn-cms.f-static.net/uploads/4370309/normal_5f8cc946224c1.pdf
- https://cdn.sqhk.co/xulawajikigi/ciisjhJ/zukiwewowiludapagefe.pdf
- https://durewisopugus.weebly.com/uploads/1/3/4/3/134369166/e7b2c.pdf
- https://cdn.sqhk.co/sepufaziru/g9Vhdgi/auction_sniper_review.pdf
- https://gexupiru.weebly.com/uploads/1/3/4/5/134576942/3018792.pdf
- https://wanuwoziburake.weebly.com/uploads/1/3/4/4/134458428/6e9ad127b36.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/zidosozawok/simuwi.pdf
- https://s3.amazonaws.com/vatosolikijike/slick_rick_mona_lisa.pdf
- https://s3.amazonaws.com/rutufokedizon/benzodiacepinas_clasificacion.pdf
- https://s3.amazonaws.com/mijumomub/20038810751.pdf
- https://s3.amazonaws.com/regovadeje/91291693136.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000cce4.bin` `9946d3968e0a1a90ac97c98c28869a1aa36d299c71883196dd438f2dcf55dfcc`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCCE4	5212 bytes
`font_01_sfnt_off0000dea9.bin` `276e1861f5886c9623ceb4ba57f8ec83c2af5d9b141bf0268c726f43afbb298c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEA9	10956 bytes

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