PDF malware analysis — malicious · c750af9364924764

MALICIOUS

PDF

144.7 KB Created: 2021-04-25 18:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10

MD5: bf84550155c53eec94beb9f0f4aaf1dc SHA-1: bb3662f9bc122c75a65a6a409fb47f6431708718 SHA-256: c750af93649247640609f9757e6ec1f99560efe963a7b91d193146b3314f7b6b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9970

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 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.
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://pelibifir.ru/strik?utm_term=what+is+developmental+theory+in+criminology PDF link annotation
- http://fesotisifofil.mygamesonline.org/phonak_brio_3_r-r_price.pdfIn PDF document text
- https://cdn.sqhk.co/gojinuma/BKIieD1/lead_school_parent_app_for_pc_download.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4501962/normal_602d6948df6a7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369317/normal_6060fc0986cb4.pdfIn PDF document text
- https://cdn.sqhk.co/furugilenu/siaamV3/talking_angela_news.pdfIn PDF document text
- http://peteferix.mypressonline.com/fedigiwupag.pdfIn PDF document text
- http://rijewomel.scienceontheweb.net/bruce_lipton_the_biology_of_belief.pdfIn PDF document text
- https://cdn.sqhk.co/fewibefanid/xTtk1jf/ms._pac-_man_arcade_cabinet.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4468296/normal_603b6a166e29c.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4465930/normal_5feb492238db1.pdfIn PDF document text
- http://nupewijanetari.medianewsonline.com/case_study_examples_file.pdfIn PDF document text
- https://cdn.sqhk.co/nowovadizeb/jW2ACic/how_to_unlock_my_snapchat_account_on_iphone.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/punurum/5453770725.pdfIn PDF document text
- http://semowomeso.onlinewebshop.net/pamudativemazubu.pdfIn PDF document text
- https://s3.amazonaws.com/nuxulikiwab/57096750925.pdfIn PDF document text
- https://s3.amazonaws.com/donukadizolin/abbyy_lingvo_x3.pdfIn PDF document text
- https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_53e4d6c586314a20ba4ba829a4cd99d6.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/bupaxomu/37639916839.pdfIn PDF document text
- https://s3.amazonaws.com/dukavunivifa/menopause_treatment_guidelines_australia.pdfIn PDF document text
- https://s3.amazonaws.com/foneniz/rang_de_basanti_song_pagalworld.pdfIn PDF document text
- https://s3.amazonaws.com/tiduro/vodavobofonufozujolud.pdfIn PDF document text
- https://s3.amazonaws.com/nolarifaforuxop/tumemiporowewi.pdfIn PDF document text
- https://s3.amazonaws.com/gomakobez/how_many_secret_zoo_books_are_there.pdfIn PDF document text
- https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_a55c56591462462da62c5da4781d5dda.pdf?index=trueIn PDF document text
- https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_1beccf15642e4162ba694d86cfbce70e.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0001e1f4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1E1F4	5664 bytes
SHA-256: `a8c0da2370d94f6f8c7d83f0c5d2a187a307e200d71ae0453d6844a9420f5fb5`
`font_01_sfnt_off0001f525.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1F525	12192 bytes
SHA-256: `a4c7c069a57ebcad4d63ca216e882c20a49a5dab3a60508d7a0449cc479e88ec`
`font_02_sfnt_off00021eab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x21EAB	16204 bytes
SHA-256: `31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf`

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