MALICIOUS
156
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1059.007 JavaScript
The PDF contains numerous external links, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM' indicating a large number of links to potentially malicious sites. One such link, http://ezfix.asia/729913796377z2ur.pdf, is identified as a critical indicator. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a pretext of a 'letter of reference for student athlete' to mask its malicious intent.
Machine Learning
- Nyx PDF Classifier malicious score 0.9997
Heuristics 5
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Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARMSmall 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.
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ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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External URI info PDF_URIPDF contains an external URL action
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Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTALThe 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.
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Embedded URL info EMBEDDED_URLOne 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://jacksth.ru/wix?keyword=letter+of+reference+for+student+athlete
- http://ezfix.asia/729913796377z2ur.pdf
- https://cdn.sqhk.co/luluzefob/YFShUZE/mega_mall_story_2_floor_compatibility.pdf
- http://myyshooop224.site/fuxubogeidgbo.pdf
- https://cdn.sqhk.co/talexadu/aIfEHW5/zombie_survival_frontier_gun_shooting_games.pdf
- https://bivufinemena.weebly.com/uploads/1/3/1/3/131380184/fuzivesipezux.pdf
- http://heretythere.site/fawideledapusetipoldcsb.pdf
- http://romeoplanet.club/figuvukigavasopuvone60c43.pdf
- http://samo-katim.ru/15776026132dsdn7.pdf
- https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/5478984.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- http://www.daltonmaag.com/
- https://s3.amazonaws.com/fifuto/23118684528.pdf
- https://s3.amazonaws.com/vudivuzakal/fipetajajif.pdf
- https://s3.amazonaws.com/zunewidimem/wigogepeberitipapikonidoj.pdf
- https://s3.amazonaws.com/fajetufekejo/pigoledo.pdf
- https://s3.amazonaws.com/dojivewobasuval/16007164106.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 3
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
font_00_sfnt_off0000f8d5.binb59322b025cbd5dc60e099744753069f24263ca48b37c2ebad2a5dd7e3e02cd9 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0xF8D5 | 4884 bytes |
font_01_sfnt_off00010965.bin28fafaa8f2ea95bc49dd10c19a6152de8b7e0d2319ab48f82c26fdcd65d1e62a |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x10965 | 10548 bytes |
font_02_sfnt_off00012d66.binb50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x12D66 | 4324 bytes |
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