PDF malware analysis — malicious · 8b5639199d9e7146

MALICIOUS

PDF

77.2 KB Created: 2021-03-22 11:27:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02

MD5: baee4f9b527ce716004e78c863b6cf3b SHA-1: 6aef4448bbbafc93d17b479f4a3da17f7065b17f SHA-256: 8b5639199d9e714651de8553e5c3a951ee02be6d9182f2334f945a2ad1528338

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 pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though truncated, indicates a lure related to academic worksheets, which is a common tactic for phishing or malware distribution.

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://resalured.ru/wix?keyword=identifying+and+creating+a+good+thesis+statement+worksheet+b+answer+key PDF link annotation
- https://cdn.sqhk.co/petawelesup/bgfTyhg/como_jogar_multiplayer_no_survivalcraft_2.pdfIn PDF document text
- http://retys.space/jaxobilupatedaxqgkn.pdfIn PDF document text
- https://cdn.sqhk.co/lotidonita/bhjifhi/64984307699.pdfIn PDF document text
- https://cdn.sqhk.co/jakofawesavo/JygiC81/jira_bug_tracking_tool.pdfIn PDF document text
- https://cdn.sqhk.co/bubiwalifeda/3lJv6ie/11187273277.pdfIn PDF document text
- http://regse.website/214305526794kp56.pdfIn PDF document text
- http://damvglaz1.xyz/kevoputuxuvusofasumaispe.pdfIn PDF document text
- https://cdn.sqhk.co/barevirus/diajfLv/51681720525.pdfIn PDF document text
- http://afracheat6.xyz/the_shadow_over_innsmouth_charactersr8blh.pdfIn PDF document text
- https://cdn.sqhk.co/laxefotogulo/eQiidhc/kikaxe.pdfIn PDF document text
- https://cdn.sqhk.co/bapuwanuvadi/2Tgcgeu/all_recharge_bill_payments_cashback_apple.pdfIn PDF document text
- https://cdn.sqhk.co/kupejabel/gjOiaSK/giwad.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://b9ecad59-ee1c-469f-8402-ddbad3bf215f.filesusr.com/ugd/84dab8_938c6624365e4dbeb239653f542933f2.pdf?index=trueIn PDF document text
- https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_608de12df29b4ea696afd3c0d51914d5.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/wowonesoribu/91605776218.pdfIn PDF document text
- https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_8eccdef6f6f148b08dc1c46b47b0b3af.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/ropidadegaxut/75910480575.pdfIn PDF document text
- https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_2ce01fc66011408888b26ad8398048db.pdf?index=trueIn PDF document text
- https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_dac5bc264bf844e29ae4b1b12c68efe9.pdf?index=trueIn 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_off0000e2f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2F0	5524 bytes
SHA-256: `f29f7a3335b0262d0234bfbd32e76cde8466e06a47b22e38ce698102913af1ce`
`font_01_sfnt_off0000f59b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF59B	10332 bytes
SHA-256: `08ead4cf5ddf1a861c0e10a224ca0af03d017dc5afba3e059f54230f9832ee07`
`font_02_sfnt_off000118c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x118C9	4324 bytes
SHA-256: `ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3`

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