PDF malware analysis — malicious · 78faa6656e61d53e

MALICIOUS

PDF

82.0 KB Created: 2021-03-31 08:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: de68c7eb50da52023af594a1252971ec SHA-1: 63d820cb38c1a3505217677242aef7d53f1b5d41 SHA-256: 78faa6656e61d53eafc2cfce89758186e307c6d08836a4f6075a67ef34e437a6

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 hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/wix?keyword=tresors+du+temps+answer+key PDF link annotation
- https://cdn-cms.f-static.net/uploads/4464720/normal_6057ffa8b2ad9.pdfIn PDF document text
- https://cdn.sqhk.co/zatufora/hjQhin4/greatest_love_song_hits_90s.pdfIn PDF document text
- https://cdn.sqhk.co/tilomulobet/gjgNgjw/93561803339.pdfIn PDF document text
- https://cdn.sqhk.co/mapetidul/1ighav0/bibuxali.pdfIn PDF document text
- http://tebaxedo.22web.org/best_free_reader_for_windows_8.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4383444/normal_5ff3df7064cac.pdfIn PDF document text
- http://poverkavoda.website/amsco_2020_answer_keyd6zny.pdfIn PDF document text
- https://cdn.sqhk.co/webepinovet/b9AYVih/businessman_audio_songs_free.pdfIn PDF document text
- https://cdn.sqhk.co/mepapogivoma/jkiddSj/69218280031.pdfIn PDF document text
- http://lorenbayi.com/global_cfg_not_found7bnhy.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://robopawize.epizy.com/najemilubiwogoma.pdfIn PDF document text
- http://zevovalik.epizy.com/business_envelope_address_format_attention.pdfIn PDF document text
- https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_5380e4906cb94b6c837dbe4dd63fd1ac.pdf?index=trueIn PDF document text
- http://koxosam.rf.gd/21169590619.pdfIn PDF document text
- http://nonidimujosapa.epizy.com/libro_de_la_kabbalah.pdfIn PDF document text
- https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_7c0be00aaad64c589b1ef688ad82893b.pdf?index=trueIn PDF document text
- https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_c7ea23742f6a441b96495adf4ccf7740.pdf?index=trueIn PDF document text
- https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_484b79c98b6a490aa9cb61bbe9f83b2b.pdf?index=trueIn PDF document text
- https://d397443b-80d0-4e74-967c-4ce830ee3754.filesusr.com/ugd/0a76f0_45aa7c43185e4282b0d61e7ae48f440d.pdf?index=trueIn PDF document text
- http://likijanima.epizy.com/bhojpuri_movie_video_song_tinyjuke.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_off0000f24b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF24B	5112 bytes
SHA-256: `ae31b7b0153cdcd4006268945b83e21db10df3cc226eea8d14267a8144883c15`
`font_01_sfnt_off000103a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103A9	12880 bytes
SHA-256: `23ea5e8f3af6cf09fc8dc89e525ce5de52d536126371b15573493595f49d11e0`
`font_02_sfnt_off00012ce1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12CE1	4324 bytes
SHA-256: `0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333`

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