PDF malware analysis — malicious · e41bddd3514056a5

MALICIOUS

PDF

69.6 KB Created: 2021-02-26 18:51:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 9fbf6c738e78a96e26da2d971a4bcf72 SHA-1: 2ea40f62f22348cc036f35739960cc93b74242c3 SHA-256: e41bddd3514056a5f7614c31fbd3b04a4abd3b1ec234d8622142609908b629f6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a keyword-based search result. ClamAV and ML classifiers flagged this as malicious phishing content. The presence of embedded URLs and the structure suggest an attempt to direct users to potentially malicious or deceptive content hosted on external sites.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://nipisod.ru/wix?keyword=reducing+soil+erosion+worksheet
- https://static.s123-cdn-static.com/uploads/4371265/normal_5fca8485b8067.pdf
- https://cdn.sqhk.co/nenuguvan/ja3cvUf/81733238513.pdf
- https://cdn.sqhk.co/sesijisova/jaijagg/fevamaxezemewuragonasu.pdf
- https://cdn-cms.f-static.net/uploads/4376105/normal_60245f97aead7.pdf
- https://cdn.sqhk.co/vusutazomaga/jReibif/fotunavovutik.pdf
- https://cdn-cms.f-static.net/uploads/4454049/normal_603524b6a96da.pdf
- https://cdn.sqhk.co/zotenejek/jinA3Rs/zidelatafo.pdf
- https://cdn.sqhk.co/wosepimi/oRkhcic/18141862291.pdf
- https://cdn-cms.f-static.net/uploads/4389804/normal_5fd6c2da8c714.pdf
- https://cdn.sqhk.co/fuvebopeweb/eCiVSfE/hit_latest_bollywood_songs_download_2019.pdf
- http://ziponep.22web.org/emulateur_android_pokemon_master.pdf
- https://cdn.sqhk.co/voguzasijur/ibhdjff/pulefazemelefo.pdf
- http://cosmeteca.com/wudobunez39w11.pdf
- https://dolilugufup.weebly.com/uploads/1/3/0/7/130776220/1798538.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- 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_off0000d569.bin` `cd2cee1459e21a2ecac68a0db0b205181dc0bd4867806ed966fda975e7982946`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD569	5152 bytes
`font_01_sfnt_off0000e705.bin` `89e61c6cfd84585b13f4ad5ca6de9ec370c02986fb4ed51db7359900f19491e5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE705	10148 bytes

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