PDF malware analysis — malicious · 21cb4e9c6c76e2b1

MALICIOUS

PDF

82.9 KB Created: 2021-04-01 20:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02

MD5: fa72374de98e67c459f6b40f77ddbff4 SHA-1: ff13ad38e96db9dbef35bfbd7df7bf14de519961 SHA-256: 21cb4e9c6c76e2b1d37377772424a754c53cdf15c8aebc3693ad99089cf322d8

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious websites for credential harvesting or further payload delivery. No scripts were extracted, but the PDF structure itself is indicative of a phishing lure.

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://pelibifir.ru/award?keyword=guilds+of+cadwallon+rules+pdf PDF link annotation
- https://kewejoxenolubur.weebly.com/uploads/1/3/5/9/135966954/xeroviba.pdfIn PDF document text
- https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/64062ac61.pdfIn PDF document text
- https://putebofodabisig.weebly.com/uploads/1/3/4/3/134368176/7f751e0aa.pdfIn PDF document text
- https://nudaduxovusupin.weebly.com/uploads/1/3/4/3/134337963/096a3.pdfIn PDF document text
- https://febadezupuwile.weebly.com/uploads/1/3/1/0/131071278/951aae6f1e.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://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_3f40e09c1650424c8632ee0964999efd.pdf?index=trueIn PDF document text
- https://2b01876c-5741-4e94-bfb6-30973e4a6517.filesusr.com/ugd/45d688_67ff915d52ae4c5e82caa4b3f9efebcc.pdf?index=trueIn PDF document text
- https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_0681a7be5fe44fe1bb8bf3b5294ede10.pdf?index=trueIn PDF document text
- http://paxomutu.rf.gd/neumonia_nosocomial_pediatria_2020.pdfIn PDF document text
- http://tixigidix.epizy.com/razepadadabukemo.pdfIn PDF document text
- https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_fe5ea2c3058247999ad53dc4d89d9c39.pdf?index=trueIn PDF document text
- https://2c0370cf-43ec-4dc9-8589-ec1e7793a70d.filesusr.com/ugd/404058_ac61586451384fcba268e034934a0be6.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/xeroguru/43337558229.pdfIn PDF document text
- https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_aeeebdeb3e0b42559414e30105a4bde7.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/xidazeze/what_subjects_are_needed_for_marketing.pdfIn PDF document text
- https://s3.amazonaws.com/davawina/fokaziguxugidaweruta.pdfIn PDF document text
- https://s3.amazonaws.com/fizup/bookworm_game_free_for_pc.pdfIn PDF document text
- https://54fa3baf-6954-44a2-98df-2137f0cc340f.filesusr.com/ugd/14b79e_4635b9dfd80d467c9ba76877d7710a46.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/sajezife/jumidexonubepuxoba.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_off0000efa3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFA3	5072 bytes
SHA-256: `73718578bcb921d5414f44031de3f12b038fc9979a73ce000b7be8c047ae6495`
`font_01_sfnt_off000100fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100FD	14836 bytes
SHA-256: `65551991b74619e22cc557cf0718d95a9a865479b9870fd95a08b6707d05c803`
`font_02_sfnt_off00013067.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13067	4324 bytes
SHA-256: `ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3`

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