PDF malware analysis — malicious · 9cb837426ced1606

MALICIOUS

PDF

79.3 KB Created: 2021-03-13 22:33:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22

MD5: f970e388366ccaa0bf6eb976d450288d SHA-1: 25e37894f5657eba5b070b3ed414c0da57e1bb15 SHA-256: 9cb837426ced16066164b89b985a2c13417b33867503cc0ca66bc70e4c301aa1

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan-like behavior. It contains numerous external links, suggesting it functions as a link farm designed to redirect users to potentially harmful websites, disguised as a search result for educational material. The presence of embedded URLs and the heuristic firing for PDF_SEO_DISPOSABLE_LINK_FARM strongly support this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
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://golowaki.ru/award?keyword=bsc+part+2+physics+practical+book+pdf+download PDF link annotation
- https://cdn-cms.f-static.net/uploads/4386842/normal_6014dc4d2e235.pdfIn PDF document text
- http://jofufuzutaki.22web.org/51388540396.pdfIn PDF document text
- http://roxopazin.iblogger.org/9th_grade_vocabulary_word_list.pdfIn PDF document text
- http://padaxopawudu.iblogger.org/adidas_316l_watch_manual.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4446379/normal_604b6fd4c81c8.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4383695/normal_5fd153a92558a.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_5c57683564384c459bf3ed89c7671388.pdf?index=trueIn PDF document text
- https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_1c37caca61544491928cbadfd8e9cae9.pdf?index=trueIn PDF document text
- http://bimivopi.epizy.com/fokolorenopevate.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/fb641521-a43d-438d-bd62-dade919414d3/dewalt_miter_saw_clamp_dw713.pdfIn PDF document text
- http://puxabilaxomim.rf.gd/bu_ali_sina_in_urdu.pdfIn PDF document text
- https://s3.amazonaws.com/firudegix/guvitik.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/2686096e-541f-465a-be36-6c9d9f4e44a3/49388216381.pdfIn PDF document text
- http://puzasapexuwuju.epizy.com/40099078035.pdfIn PDF document text
- https://s3.amazonaws.com/tevigotu/guidewire_developer_jobs_in_singapore.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/86d57ae8-21da-4dca-af43-2297301c1081/kali_linux_programs_on_ubuntu.pdfIn PDF document text
- https://147762ec-90f0-4523-8579-43cb3cd17c82.filesusr.com/ugd/6c48b9_fec0feacc130493d831d92bf9c02221e.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/8215e671-0f71-4783-8794-9d265bf88189/75855873957.pdfIn PDF document text
- http://nararinakajufu.rf.gd/implant_biomaterials.pdfIn PDF document text
- http://garolelawugo.epizy.com/67417444130.pdfIn PDF document text
- https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_c77922726d8e4be59e20666996f7e628.pdf?index=trueIn PDF document text
- http://bodagoge.epizy.com/10343066528.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e835.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE835	5492 bytes
SHA-256: `507b3a61eeb3a1e1367d715c794aa6ac0f9f1d762bbf2a0f2ba6489b5ec06eed`
`font_01_sfnt_off0000fae6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAE6	11208 bytes
SHA-256: `7e8069f1426f49f0a5aed2df3b3c030a7b9eede2081e97f04e60b21bbc33077c`
`font_02_sfnt_off00012142.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12142	4324 bytes
SHA-256: `b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c`

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