PDF malware analysis — malicious · 85c8435c34994574

MALICIOUS

PDF

80.9 KB Created: 2021-03-21 02:14:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17

MD5: 91c04e556bb33b1f1d58a3f45223702c SHA-1: cd2e29821d8aa85a34e08c6f8ba29d99fa98e8a7 SHA-256: 85c8435c349945746e34a8c76cddd276cb8e6822dddc8c956cfc03cf9b855f53

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 high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a disguised worksheet, likely intended to trick users into clicking malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://nipisod.ru/wix?keyword=independent+and+dependent+variables+math+worksheet+6th+grade+pdf PDF link annotation
- http://wojesukuzak.mygamesonline.org/stihl_024_av_carburetor_adjustment.pdfIn PDF document text
- http://zitalogeloluwiw.mygamesonline.org/spread_spectrum_modulation_in_digital_communication.pdfIn PDF document text
- https://cdn.sqhk.co/redodadix/mgem7gj/begalezowademesapo.pdfIn PDF document text
- https://cdn.sqhk.co/tosilura/apgjxij/.pdfIn PDF document text
- http://zonerokemub.getenjoyment.net/vifimujomaki.pdfIn PDF document text
- http://rujisuki.mygamesonline.org/black_boy_richard_wright_chapter_2.pdfIn PDF document text
- https://cdn.sqhk.co/kulobibab/ffhExib/54038851726.pdfIn PDF document text
- https://cdn.sqhk.co/lelabepena/qjjuidJ/5320294652.pdfIn PDF document text
- https://cdn.sqhk.co/worijekegir/Pehaggb/2018_world_cup_song_free.pdfIn PDF document text
- http://xenojupu.mywebcommunity.org/troy_bilt_tb635ec_owners_manual.pdfIn PDF document text
- http://vexasefagi.scienceontheweb.net/junuju.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
- http://gebezivorubax.rf.gd/parasitologia_humana_neves_online.pdfIn PDF document text
- http://sulorowanutabu.atwebpages.com/numimok.pdfIn PDF document text
- http://lapafat.rf.gd/17991413038.pdfIn PDF document text
- http://sogivuwe.onlinewebshop.net/definitions_in_c_language.pdfIn PDF document text
- https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_0574f3f58307421d81688601c5f06a68.pdf?index=trueIn PDF document text
- http://runesufosufej.rf.gd/microsoft_word_thank_you_card_template_blank.pdfIn PDF document text
- https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_54401f020a2e488cbd08e7b3f628b43b.pdf?index=trueIn PDF document text
- https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_b0d52c632e6c4220b33aea3dba65875e.pdf?index=trueIn PDF document text
- https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_cafbc5e99b394f06af945b7065d8a263.pdf?index=trueIn PDF document text
- https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_2ad4a11e20a6472a95d069c096a44d76.pdf?index=trueIn PDF document text
- https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_5bf4df3d117b474da5c9be9eb2c101ec.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_off0000ed35.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED35	5688 bytes
SHA-256: `f6a6917bf8e3e6bd0ee547058dbbfc1f3d7e0f844cc5027d5af5e9b4f13cba87`
`font_01_sfnt_off0001006a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1006A	12276 bytes
SHA-256: `56d64ec450aa99b6f57fd5d24624e4068cd420719e7a7227fe53e604b3ce9b2f`
`font_02_sfnt_off0001279d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1279D	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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