PDF malware analysis — malicious · 5ae8f5d09ae5e6e3

MALICIOUS

PDF

80.4 KB Created: 2021-06-09 00:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: af38ec3ee87fb89d7c90b32de2961811 SHA-1: 5b00ee1c118f6f2cba1c4a1bfe44c07268e9508e SHA-256: 5ae8f5d09ae5e6e399996030de07874268c69eaee65e7c40fd694ba9f6e482da

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains text related to a 'reading comprehension test' and references the wkhtmltopdf tool, indicating a potential lure to external malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

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 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.
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://coretry.ru/pbw?utm_term=short+reading+comprehension+test PDF link annotation
- https://janilanupaga.weebly.com/uploads/1/3/4/6/134673225/bunijadofekib.pdfIn PDF document text
- https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/fusowes.pdfIn PDF document text
- https://pexesalakodosok.weebly.com/uploads/1/3/4/6/134650812/6986258.pdfIn PDF document text
- https://gavojaxuwutik.weebly.com/uploads/1/3/4/3/134319320/9608915.pdfIn PDF document text
- https://vogovolakufa.weebly.com/uploads/1/3/4/8/134874318/vanulimaloki.pdfIn PDF document text
- https://wiselorasen.weebly.com/uploads/1/3/0/7/130739143/kukagem.pdfIn PDF document text
- https://pasezoxe.weebly.com/uploads/1/3/5/3/135347718/9236260.pdfIn PDF document text
- https://tamidotojo.weebly.com/uploads/1/3/1/8/131858916/6256457.pdfIn PDF document text
- https://kodikitowi.weebly.com/uploads/1/3/4/7/134768405/1b0e0a3.pdfIn PDF document text
- https://durunefa.weebly.com/uploads/1/3/4/7/134712847/dexiwogubux_loxezuxikaj.pdfIn PDF document text
- https://tagojakiwuki.weebly.com/uploads/1/3/4/4/134444274/zikapumiber.pdfIn PDF document text
- https://pikimekexer.weebly.com/uploads/1/3/4/5/134587048/besoxilodobekitep.pdfIn PDF document text
- https://diwopoko.weebly.com/uploads/1/3/4/5/134597367/reziwefenaz.pdfIn PDF document text
- https://vuwawirekexaz.weebly.com/uploads/1/3/0/9/130969699/8829e2b978d.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/adef143e-7be4-40e8-a21c-7e1210d63d33/modern_car_parking_3d_mod_apk_unlimited_money.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/7d3e7d8f-04c0-40ce-aea3-e54b3b41b62e/where_is_the_manual_eject_screw_on_ps4.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/06537550-4954-4897-a194-b718fbc71116/34564962265.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/ad646dac-e192-4600-9f4a-1b6f9f1d9337/whirlpool_dishwasher_wdf320pads2.pdfIn PDF document text
- http://zuvevetub.pbworks.com/w/file/fetch/144421761/9396918819.pdfIn PDF document text
- http://lulatigono.pbworks.com/f/divorce_buyout_agreement_form.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fdfd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDFD	5556 bytes
SHA-256: `96c9ad2924fd3ed329c3a00450524c9ec8d7f105303d7dacdf2e1b9e3f33950c`
`font_01_sfnt_off000110b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110B7	10424 bytes
SHA-256: `c59b645d7894315a4b4720d07d8c07b4e085e8bfafb99631ee30f4621178540f`

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