PDF malware analysis — malicious · c4fbd38c52d0a6a7

MALICIOUS

PDF

76.7 KB Created: 2021-03-20 22:19:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13

MD5: 3080e47d2f8f3558ef04d4a2288fb3bc SHA-1: d49378205e027b63d6cdd7e4e6462324dd9ed286 SHA-256: c4fbd38c52d0a6a71f94668a2fadef77ed4a65480a6cc9764e9159cfa3de631f

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary suspicious URL being https://midufefew.ru/aws. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links, likely for SEO poisoning or to distribute various malicious payloads. Although no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs strongly suggest a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://midufefew.ru/aws?utm_term=standard+reduction+potential+table+printable PDF link annotation
- https://static.s123-cdn-static.com/uploads/4445550/normal_5fe42272c12a1.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4387230/normal_6020557ba7521.pdfIn PDF document text
- http://mazipuvaxa.mywebcommunity.org/79006420108.pdfIn PDF document text
- https://musuvawe.weebly.com/uploads/1/3/4/5/134528527/2354611.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4484122/normal_6018e688de190.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4422897/normal_60250d846e092.pdfIn PDF document text
- http://setafugeridol.scienceontheweb.net/93065020191.pdfIn PDF document text
- http://lulopoboxefon.scienceontheweb.net/asus_rt-ac66u_a1_aimesh.pdfIn PDF document text
- https://kifoguwo.weebly.com/uploads/1/3/1/3/131383532/5021501.pdfIn PDF document text
- https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/6129307.pdfIn PDF document text
- http://dotenipago.medianewsonline.com/aluminium_alloys_properties.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4446633/normal_5ff9baf69de47.pdfIn PDF document text
- http://gigabaru.22web.org/bosagudobuzo.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://gavojomizam.epizy.com/89935060461.pdfIn PDF document text
- https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_761271e47b2040a79374cb3e551a0378.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/dadupawo/global_competitiveness_report_2019_uae.pdfIn PDF document text
- https://s3.amazonaws.com/supefujoxopubu/abc_ny_traffic_reporters.pdfIn PDF document text
- https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_dcee675578a84890b6eeb5075aae118e.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/pusori/fix_portable_dvd_player_not_reading_discs.pdfIn PDF document text
- https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_3f5e776c2df44ca3ab25247b933f9159.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/loxopudizus/jekorug.pdfIn PDF document text
- https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_d7e0c15d271b487fa78fb17986d72cd8.pdf?index=trueIn PDF document text
- http://duxegejuw.atwebpages.com/41805594725.pdfIn PDF document text
- https://eeeff038-21f9-42a6-bde0-cd945221d618.filesusr.com/ugd/9dc459_37cdb7dcaa894e64981cc1ef9ad97efa.pdf?index=trueIn PDF document text
- http://rinubokuj.rf.gd/ugly_love_series.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_off0000ec6b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC6B	5132 bytes
SHA-256: `59d4236e2962f38a1baed93ab0cccb0a1e1a5a2284a2dfdcdf75ba0718db40ef`
`font_01_sfnt_off0000fde7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDE7	10920 bytes
SHA-256: `262693a9b9d536d830e86ba47edf7bdf8b766b2dde4239d4f43e48537692803c`

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