Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb551d5463eac6c…

MALICIOUS

PDF

75.4 KB Created: 2021-04-03 14:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: dfa5c2ee098fe40947ff945284138d4b SHA-1: 789947fb8d451cd0dc45942f05e294738d5ef1d4 SHA-256: 2bb551d5463eac6c368e351b674a033735bb180880a220a27bf02ff12afb5095
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The presence of these URLs and the heuristic indicating a link farm strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://soxebez.ru/strik?utm_term=xkcd+thing+explainer+game PDF link annotation
    • http://wiregabjuk.fun/user_login_report_dynamics_365mp6c6.pdfIn PDF document text
    • http://dotenipago.medianewsonline.com/bypass_gstrico.pdfIn PDF document text
    • http://cancandance.org/gender_congruence_and_life_satisfaction_scale9bzzg.pdfIn PDF document text
    • http://romeoplanet.club/tozaborododegesojuzame9xcby.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://instapriz.site/gta_san_andreas_apk_aptoide_ioso46iq.pdfIn PDF document text
    • http://smirno.life/miguel_serrano_nos_el_libro_de_la_resurrecciongob2l.pdfIn PDF document text
    • http://vutunema.mypressonline.com/91422378355.pdfIn PDF document text
    • http://egrn-order.online/74770850441pj0eb.pdfIn PDF document text
    • http://alkim.xyz/wheel_of_time_total_word_countiq9dc.pdfIn PDF document text
    • http://deromgroup.com/how_can_i_get_a_plat_map_of_my_propertyuln74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_9b21fa92700d492b894a36d599308662.pdf?index=trueIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_9db81a7606724d56b4b7674081468e43.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/76317390876.pdfIn PDF document text
    • http://vugugemo.atwebpages.com/british_passport_application_form_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/what_are_the_principles_of_influence.pdfIn PDF document text
    • http://benugafudom.epizy.com/dell_poweredge_r510_datasheet.pdfIn PDF document text
    • http://sigadoba.epizy.com/37904149911.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/zelifinimobalap.pdfIn PDF document text
    • http://vidomolojo.epizy.com/lesivadugokore.pdfIn PDF document text
    • https://1dfef493-bba3-4db0-89f7-7cef958ceea2.filesusr.com/ugd/3dbeb3_bcde6aa4675342e6ae5f42743978c6df.pdf?index=trueIn PDF document text
    • http://fotoburiwolof.rf.gd/cancer_colorretal_2018.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.

FilenameKindSourceSize
font_00_sfnt_off0000e7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AB 5416 bytes
SHA-256: 65cc7d255ecabe412a4c9526871662c526ec8c1563efb3886a4a5f2e7813aabf
font_01_sfnt_off0000f9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 10860 bytes
SHA-256: 73ca606e92538bf9312f381a3b5a2255323f1c332d4280c6bac0a45bb7035483

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