Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c26c5d68e4f0e1d…

MALICIOUS

PDF

78.1 KB Created: 2021-03-29 08:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a7f1954c1a13dd1493c70ef321d9fbb2 SHA-1: 380a9e73e7a242e50f76033fe069879cdac8600e SHA-256: 3c26c5d68e4f0e1d6c62ca9e2363ae902fee0fe14f57fb1be8a46d339db0b85f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, but the presence of URLs like 'https://nipisod.ru/strik?utm_term=my+summer+infant+baby+monitor+says+no+signal' indicates a lure, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=my+summer+infant+baby+monitor+says+no+signal PDF link annotation
    • http://fruit-ita.fun/matozisofiwoviwuzs28b1.pdfIn PDF document text
    • http://xaredazisom.mywebcommunity.org/28479507608.pdfIn PDF document text
    • http://nujijaj.getenjoyment.net/tratamiento_nutricional_para_anorexia_y_bulimia.pdfIn PDF document text
    • http://kmikaerfs.ru/lukifekubudaneliwirkzlvx.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/bedolasovodatevilonite.pdfIn PDF document text
    • http://cashbackmoney.info/523305343055dwdm.pdfIn PDF document text
    • https://befufagu.weebly.com/uploads/1/3/1/3/131384284/4af652ae38fa6.pdfIn PDF document text
    • https://ronojunigamedez.weebly.com/uploads/1/3/5/2/135297775/ce4324.pdfIn PDF document text
    • https://kuvomudoriri.weebly.com/uploads/1/3/1/4/131406544/vamifaf_wukarixuba.pdfIn PDF document text
    • http://nalutomabesuso.iblogger.org/newogedikosefuligolezo.pdfIn PDF document text
    • https://vumizopefi.weebly.com/uploads/1/3/5/3/135313358/valokavo.pdfIn PDF document text
    • http://health2health.online/402498614002rp4n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f105aebd-5199-4850-b66b-5e341bb41aba/what_to_write_my_college_essay_on_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/123fd3bc-d5b9-4c94-883d-df2cb8fc4462/witoketove.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/dark_web_app_for_pc.pdfIn PDF document text
    • http://porumujowupof.epizy.com/wanalive.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/99214028561.pdfIn PDF document text
    • http://sozikopozik.epizy.com/felifuzisonujavakel.pdfIn PDF document text
    • http://migegavirunafo.rf.gd/13141241225.pdfIn PDF document text
    • http://segimoto.myartsonline.com/jawujuv.pdfIn PDF document text
    • http://rivekutunuji.rf.gd/neolithic_revolution_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/autoclave_procedure.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_off0000f248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF248 5332 bytes
SHA-256: 930a080c022b566058f8fa7278c1821ccc940e7bf4a7a2934fed035b64338d0d
font_01_sfnt_off0001046d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046D 11336 bytes
SHA-256: 1b7984d7c0a90933621a1f591b2d7fcdc86b8efee60f2d55c4dc062e87c1ae58

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