Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8b991e7ba4a125…

MALICIOUS

PDF

79.7 KB Created: 2021-04-08 15:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a8719a6fce7703186838137fb7541f2b SHA-1: aa4ded97dc881276edf935d72ffe124afe17546c SHA-256: 0b8b991e7ba4a1250f62b7d33795bb6b0f8888ab4198fcb75761313b5f5f2c24
194 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The presence of urgency language further supports a phishing or scamming motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mezovuduw.ru/strik?utm_term=star+wars+best+book+series PDF link annotation
    • http://xedeporib.medianewsonline.com/structural_functionalism_sociology.pdfIn PDF document text
    • https://lututigit.weebly.com/uploads/1/3/5/3/135335707/fafakugajusomeduxenu.pdfIn PDF document text
    • https://lesejudojava.weebly.com/uploads/1/3/1/1/131164013/e68266fcf.pdfIn PDF document text
    • http://winoorama.fun/asus_wifi_extender_ea-n66_setupp9cye.pdfIn PDF document text
    • http://cg-designer.xyz/31545401876mx8f8.pdfIn PDF document text
    • https://kuxilididid.weebly.com/uploads/1/3/4/3/134387830/bamabazuzirow.pdfIn PDF document text
    • https://puxorubawi.weebly.com/uploads/1/3/5/3/135349856/fatorotemowoj.pdfIn PDF document text
    • http://wide-take.top/gojoxifabizubwip7i.pdfIn PDF document text
    • https://ziperivowupidu.weebly.com/uploads/1/3/1/3/131381589/1b786.pdfIn PDF document text
    • http://jabewes.medianewsonline.com/95190655467.pdfIn PDF document text
    • http://golixudib.mypressonline.com/zinedutativutonurobosasuf.pdfIn PDF document text
    • http://levotavo.scienceontheweb.net/wpf_tutorial_kudvenkat.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/dosalapasenow/hunger_games_mockingjay_part_2_full_movie_download_in_hindi.pdfIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_25d50ffe0f594c6abaf09b1db76139c7.pdf?index=trueIn PDF document text
    • http://defakulid.atwebpages.com/libro_aura.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/najosanotoro.pdfIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_4b47c25672014b80a8e171ed4210e20e.pdf?index=trueIn PDF document text
    • http://malejubu.myartsonline.com/86743278923.pdfIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_bdcef5d9db4b4007bfaa0d9407a4dd48.pdf?index=trueIn PDF document text
    • http://jazopizebe.atwebpages.com/xigavibatefoxawam.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_off0000f95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95B 5048 bytes
SHA-256: 5bc4049a787d2ea08800f88325fdd429032739eaa3c4ae5167bbef3cc70bd609
font_01_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 11416 bytes
SHA-256: d3f717578aa198cf67cb855b39c164339e29737a31da3dc83fea18989ca97442