PDF malware analysis — malicious · 3a71885ca272b173

MALICIOUS

PDF

76.3 KB Created: 2021-06-14 23:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13

MD5: bbcc791fc80cacf0aeca7f9329d07538 SHA-1: 72456a0b839b13d555a0c837119bdcfe33274012 SHA-256: 3a71885ca272b17399685bcda420f28a497923d44fe6381989d409ffbe306f3a

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains heuristics indicating it is a link farm designed to lure users with terms like "crack product key". The primary malicious URL identified is https://cructi.ru/pbw, which is likely part of a phishing or malware distribution scheme. ClamAV detection further supports its malicious nature, classifying it as Pdf.Phishing.Trojan.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 5

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 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://cructi.ru/pbw?utm_term=crack+product+key+microsoft+office+2016 PDF link annotation
- https://kilizalulalikog.weebly.com/uploads/1/3/0/9/130969980/5267854.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4417119/normal_6013dc919fb39.pdfIn PDF document text
- https://nuzukozifazo.weebly.com/uploads/1/3/2/6/132682871/4550436.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4412408/normal_5ff6531fca8ab.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4486763/normal_605c6192abc29.pdfIn PDF document text
- https://zetizisoxaw.weebly.com/uploads/1/3/4/4/134498522/lonomin_batedidotupow_mavegodoxe_sumikifevugafo.pdfIn PDF document text
- https://mapaforidax.weebly.com/uploads/1/3/4/0/134012560/xememoviwato.pdfIn PDF document text
- https://dobizonetalede.weebly.com/uploads/1/3/5/3/135394553/jemakisi.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4449990/normal_6069e615375d2.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://uploads.strikinglycdn.com/files/eb8c4b7c-bf80-45fb-8107-86330bbf77cf/manorama_year_book_tamil.pdfIn PDF document text
- http://tuxafivimit.pbworks.com/w/file/fetch/145128879/62609886644.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e09d9c79-6070-45a3-9e13-71c95f8e9053/movies_like_geralds_game_reddit.pdfIn PDF document text
- http://kabutizagix.pbworks.com/f/midenawatasabevapota.pdfIn PDF document text
- http://tujedet.pbworks.com/w/file/fetch/145258878/76584376125.pdfIn PDF document text
- http://vonodatob.pbworks.com/w/file/fetch/145300008/secret_superstar_full_movie_download_link.pdfIn PDF document text
- http://joxupakager.pbworks.com/f/wiworaratapo.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/dc0aa556-5fe7-4090-9b61-91860dd3b2e4/nixatufejagipoxa.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/6bcd7671-8160-43d8-b35d-22f5365a35ca/pebujevetilapofonomad.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/84a311b9-f9be-4da5-b036-218e2e9d4026/doduzusijibijareju.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_off0000e05a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE05A	5716 bytes
SHA-256: `8307b594e6b58a43cd6ca8662afc7fd0d4d5e6bf209527d19633594881bee236`
`font_01_sfnt_off0000f3e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3E9	9960 bytes
SHA-256: `6609334793db2019e7d7ca6e6f7e8ba59e3b9841dae029916742341ab0a2fe93`
`font_02_sfnt_off00011616.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11616	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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