Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8bdedb5ceb6dd9…

MALICIOUS

PDF

87.9 KB Created: 2021-04-27 01:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 04186cce7e03f9239c264fc92f6aa863 SHA-1: 286e1d4b4abb9c05005422c28d0a6134ce0466cd SHA-256: ec8bdedb5ceb6dd9f6296cbeb2967e0044553092501ea9fa22fac677d33ffc1d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://xajibur.ru/strik?utm_term=sony+ht-ct770+subwoofer+pairing+without+remote PDF link annotation
    • https://torofijode.weebly.com/uploads/1/3/5/9/135978969/cc3e648f.pdfIn PDF document text
    • https://raduwefun.weebly.com/uploads/1/3/1/1/131164260/569376.pdfIn PDF document text
    • http://shoop-fl.ru/new_york_metro_north_mape64vo.pdfIn PDF document text
    • http://bigezidara.mypressonline.com/vuwurozalekunawipotezer.pdfIn PDF document text
    • https://lesamasipedu.weebly.com/uploads/1/3/0/7/130739144/vopex.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/af8f828052e60.pdfIn PDF document text
    • http://letilemugemin.66ghz.com/makkar_ielts_speaking_june_2019.pdfIn PDF document text
    • https://diwifiburu.weebly.com/uploads/1/3/4/8/134871147/9862415.pdfIn PDF document text
    • https://baboxubawuxi.weebly.com/uploads/1/3/4/6/134666135/2256218.pdfIn PDF document text
    • https://mubajodopiwal.weebly.com/uploads/1/3/1/4/131454521/504141.pdfIn PDF document text
    • http://homeolimp.com/9935621889k1tk1.pdfIn PDF document text
    • https://lupoxever.weebly.com/uploads/1/3/1/4/131413766/lejesodoveb-xiwajaguba.pdfIn PDF document text
    • https://suzazega.weebly.com/uploads/1/3/4/4/134476369/pitajerekigerik.pdfIn PDF document text
    • http://jaladonubitow.22web.org/90096936315.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://genojamezuti.rf.gd/futuros_amantes_chico_buarque_cifra.pdfIn PDF document text
    • http://viwaneb.rf.gd/47463210605.pdfIn PDF document text
    • http://rereroma.epizy.com/aflame_penelope_douglas_romana.pdfIn PDF document text
    • http://zokadulozebeza.rf.gd/best_animation_making_software_for_pc_free_download.pdfIn PDF document text
    • http://vubetogezomu.rf.gd/xewejelunixisuximotu.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/how_to_fix_rowenta_commercial_steamer.pdfIn PDF document text
    • http://pakedexiradisiz.epizy.com/tudimuxovuvinujoxilutet.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_off0001154a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154A 6088 bytes
SHA-256: 33e3b9fef70cc2585e4d3d507e8e0ca54e02177da84e2e38b455088c1f185862
font_01_sfnt_off00012a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A01 11884 bytes
SHA-256: 88b76c273dc0280d0adf2bb5d99dfefecddeff77c6ecf4f843d22f5cb3fbcbdd

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