PDF malware analysis — malicious · c6d81b87c8fd240c

MALICIOUS

PDF

75.6 KB Created: 2021-05-01 21:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 97c6fa0294d64640336dcbb84e3fbd61 SHA-1: c81d5a7290f1308b081488affe6f89d0a26a3669 SHA-256: c6d81b87c8fd240cb5b5fa5575cee6f2e83fdbb3de54a9094898d03f2d5666a0

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of an SEO spam or phishing campaign. The document body, though heavily obfuscated, contains references to 'Russian alphabet flashcards' and metadata indicating it was generated by wkhtmltopdf, likely to disguise its true purpose.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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://dugedepap.ru/strik?utm_term=russian+alphabet+flashcards PDF link annotation
- https://cdn.sqhk.co/lotivadafe/hcaifgc/some_superhero_ringtones.pdfIn PDF document text
- http://moneymaya.site/english_grammar_class_11_note_making1fjtu.pdfIn PDF document text
- https://filuvinuro.weebly.com/uploads/1/3/4/4/134455556/5738470.pdfIn PDF document text
- https://zewakifu.weebly.com/uploads/1/3/0/7/130740590/figifozolerezetav.pdfIn PDF document text
- https://vumazara.weebly.com/uploads/1/3/0/7/130738753/jusazasi_kaxomek.pdfIn PDF document text
- https://cdn.sqhk.co/rovifatira/Bieigji/lekexit.pdfIn PDF document text
- http://mandarin-fruit.space/achilles_tendon_physical_therapy_exercisesvw1yj.pdfIn PDF document text
- https://xepezexitig.weebly.com/uploads/1/3/0/9/130969834/nubogotubipuvur.pdfIn PDF document text
- https://kixaxadamakike.weebly.com/uploads/1/3/0/7/130775249/sixelokomitiser.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_15129d41ef694c69ab125bd1c9629ecd.pdf?index=trueIn PDF document text
- https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_ac8462a1efd74e94ae8a826efd7ca9a4.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/818c0a5f-9bf6-4f61-ae48-e427dec6d175/can_you_make_smoothies_without_blender.pdfIn PDF document text
- https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_8628d2c0491844cb93f0487022e60ba3.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/d07aea24-a720-4a8b-a137-809d6729d356/debumusisaro.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b1110593-7562-481c-ad71-241e73f3a45a/what_is_dependency_theory_and_nafta.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/173790c5-c7d2-4983-92e2-1c31c8b11c4b/parts_of_speech_chart_montessori.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e1713194-7aaa-462d-bbf9-47aeaae288ac/the_monkey_king_4_full_movie_in_hindi_download_movies_counter.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/236606db-1a5a-4033-9ca2-d52cedbddb11/how_much_does_an_operating_room_nurse_make_in_canada.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_off0000e860.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE860	5392 bytes
SHA-256: `1a1698e652aa0d1c0a6e0f3f4e5c83feb55cf6c2c42e148b63307bcf18de938b`
`font_01_sfnt_off0000faa8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAA8	11612 bytes
SHA-256: `19c02d4820158a15666f07eaa9aa7404e0294d4b95ffe758aa8fcc8db4fa7692`

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