Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ac59ca618ca52b…

MALICIOUS

PDF

84.5 KB Created: 2021-04-09 00:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 142dfe1ed6ec943ed711176e331ef7f8 SHA-1: e214284dba956062bb239bfe22467522bfc24575 SHA-256: 55ac59ca618ca52b89d18d9c5cf96312c359f54790085204210272a758068452
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with one prominent URL leading to 'pelibifir.ru'. Heuristics indicate a link farm and ClamAV detected it as 'Pdf.Phishing.Trojan'. The document body, though partially corrupted, suggests a lure related to 'Christian dream books', aligning with phishing or malware distribution tactics. No scripts were extracted, but the overall structure and URL distribution point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=como+hacer+un+libro+de+sue%25C3%25B1os+cristiano
    • https://cdn-cms.f-static.net/uploads/4450504/normal_5fd2d4ac50e4f.pdf
    • http://pearhaidhr.fun/8565638029hcs2i.pdf
    • https://zizojatemizowen.weebly.com/uploads/1/3/4/0/134016780/5013985.pdf
    • http://specialsale.info/2002_honda_rancher_350_top_speedvdm6m.pdf
    • http://rentline.pro/best_transitions_to_start_a_paragraph8ycy1.pdf
    • https://static.s123-cdn-static.com/uploads/4480585/normal_5ffdedbd30481.pdf
    • http://indital.space/how_to_do_critical_appraisal_of_an_article291xv.pdf
    • https://woxevodojagub.weebly.com/uploads/1/3/4/6/134623787/9547c9.pdf
    • https://cdn-cms.f-static.net/uploads/4446492/normal_60608df25c092.pdf
    • https://static.s123-cdn-static.com/uploads/4474191/normal_5ff3c0925eb54.pdf
    • http://cardio-natural.info/fekuzilukoxixokapivezasevp7e1.pdf
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/wiwamasomamonapanem.pdf
    • https://fibobamoga.weebly.com/uploads/1/3/1/6/131607866/juwemigapi-pelosatizawute-tuzodur-kesadeno.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1d36d478-80b0-4653-9eb7-440aba1d23c5/resumen_del_libro_11_minutos_paulo_coelho.pdf
    • https://uploads.strikinglycdn.com/files/a6d78f1a-49ba-4bd5-8928-684db01fab1d/pair_motorola_baby_monitor_to_phone.pdf
    • https://s3.amazonaws.com/luramamelolem/guided_reading_activity_infancy_and_childhood.pdf
    • https://uploads.strikinglycdn.com/files/3afe2920-9118-43d3-a717-e5f59e5fe8cb/17851486762.pdf
    • https://uploads.strikinglycdn.com/files/3dd7cc4a-8d89-433b-83bd-fd8457956514/famejexobenadi.pdf
    • https://uploads.strikinglycdn.com/files/50924beb-f25c-48e3-b327-50f451a58bd2/pediatric_med_calculation_practice_problems.pdf
    • https://s3.amazonaws.com/gixawetopoli/78127155282.pdf
    • https://s3.amazonaws.com/zunewidimem/vafezulumovevirezosadaz.pdf
    • https://uploads.strikinglycdn.com/files/68121a94-ac96-4453-9353-abd46c918160/koxepopi.pdf
    • https://uploads.strikinglycdn.com/files/309d621b-1140-4431-96c8-5148d327a8ad/what_is_the_salary_of_a_compliance_manager.pdf
    • https://uploads.strikinglycdn.com/files/147dc749-525e-4981-bf1e-0c7f03bb10e2/the_green_mile_movie_poster.pdf
    • https://s3.amazonaws.com/wujixus/newefekosefiwenos.pdf
    • https://uploads.strikinglycdn.com/files/94aa387b-3053-426c-9f98-11a8cde9f645/xogorigugigebamofe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001086c.bin
69a87d15e703c0872246996b2532cfdb2d614e2fcfcc0c59e408d847196092b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 5436 bytes
font_01_sfnt_off00011a69.bin
27b7d64f9e54d6fe9029fa69d3d05191650c0651472ea1217a63eed56a15e533		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A69 12584 bytes

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