PDF malware analysis — malicious · 1a76befb27d2103c

MALICIOUS

PDF

68.6 KB Created: 2020-11-18 05:39:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 8d5f4921571e8e76f4d984c4ac97e600 SHA-1: 1411990b60824eae8c784d88844d69562b57791f SHA-256: 1a76befb27d2103c0ba60f08d47ba52766e67eaf687f3af942bdd88d48e03bd6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external PDF links, suggesting an attempt to manipulate search engine rankings or direct users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

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://traffset.ru/123?utm_term=derivation+of+bragg%2527s+law+pdf
- https://cdn-cms.f-static.net/uploads/4365549/normal_5f8db24b8c22c.pdf
- https://degujipimisa.weebly.com/uploads/1/3/1/4/131453395/nonazotun.pdf
- https://cdn-cms.f-static.net/uploads/4473432/normal_5faec50fd4930.pdf
- https://cdn-cms.f-static.net/uploads/4374696/normal_5f9cb72b4a2b2.pdf
- https://givexikiduxa.weebly.com/uploads/1/3/1/3/131398224/podud_peres_bupitinesalojew.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/gonima/89514209043.pdf
- https://s3.amazonaws.com/tuxutedi/sopefipiloruli.pdf
- https://uploads.strikinglycdn.com/files/72b3e179-ad05-4f95-8641-e025e49f91fb/durob.pdf
- https://uploads.strikinglycdn.com/files/8eb1324d-24bb-477f-af7a-85ddcedd1ee2/bojatodoxija.pdf
- https://uploads.strikinglycdn.com/files/f1197c30-7e8b-4035-95cd-047c3c09b456/vikefedidorepejiwalusidor.pdf
- https://s3.amazonaws.com/gupuso/20540891615.pdf
- https://uploads.strikinglycdn.com/files/28cff572-19a8-485b-bd98-bff42391bc1f/simone_browne_dark_matters.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_off0000cb2a.bin` `60ebae812b44b7344486332d15acd26a608fee3995bf652ce78e26a53372a361`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB2A	5536 bytes
`font_01_sfnt_off0000de27.bin` `78aaf0ea69c6bba9171fffd79ccc8fa244db1be5a54325248f25a17977529c04`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE27	11808 bytes

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