Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5043bbea6555cd2…

MALICIOUS

PDF

76.3 KB Created: 2021-06-11 10:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0560ecb0c8e7c38bcaa8318d614dcab7 SHA-1: af6275ec32b3ad13ae02133191c60940b67eda60 SHA-256: f5043bbea6555cd25d919bb7f4ebb654e67b379477c32635d670990541218338
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm or phishing lure, indicated by the presence of numerous external links, many hosted on disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the extensive link farm points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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 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://crysiq.ru/pbw?utm_term=the+necklace+lesson PDF link annotation
    • https://rupanusevufow.weebly.com/uploads/1/3/1/3/131380126/semamajogiga.pdfIn PDF document text
    • https://mujurusema.weebly.com/uploads/1/3/4/8/134846640/rugizikivawedis-rapakovizesagiw.pdfIn PDF document text
    • https://wufavupo.weebly.com/uploads/1/3/4/3/134319323/74c6773b1967b.pdfIn PDF document text
    • https://wezunemoxojo.weebly.com/uploads/1/3/5/3/135321606/9001247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463005/normal_6069c3c3f1a64.pdfIn PDF document text
    • https://wejefagujevixow.weebly.com/uploads/1/3/4/4/134472609/a9c067f8541b702.pdfIn PDF document text
    • https://dopapebo.weebly.com/uploads/1/3/4/8/134870178/nezevawozedopis.pdfIn PDF document text
    • https://ruregojuze.weebly.com/uploads/1/3/2/8/132814589/c39449dd1c9.pdfIn PDF document text
    • https://bobefadapuxat.weebly.com/uploads/1/3/4/8/134858353/9917a36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_603e6fd671a71.pdfIn PDF document text
    • https://divisekul.weebly.com/uploads/1/3/5/3/135347680/sobelujo_kowonigere.pdfIn PDF document text
    • https://xalosexi.weebly.com/uploads/1/3/4/6/134685437/9463566.pdfIn PDF document text
    • https://zefijevizo.weebly.com/uploads/1/3/2/3/132302816/801bc515bad01.pdfIn PDF document text
    • https://wiperorapaxomun.weebly.com/uploads/1/3/5/3/135323561/d1094def.pdfIn PDF document text
    • https://silagonamep.weebly.com/uploads/1/3/1/4/131452845/90a54bc0b.pdfIn PDF document text
    • https://seserasug.weebly.com/uploads/1/3/4/6/134678868/3278712.pdfIn PDF document text
    • https://rivixemip.weebly.com/uploads/1/3/4/6/134609840/a651585eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484997/normal_6028aa2dd59a1.pdfIn PDF document text
    • https://paxuxavige.weebly.com/uploads/1/3/4/3/134373921/fodel_vorowimon_somirukegimidul_levuralari.pdfIn PDF document text
    • https://kivijakesav.weebly.com/uploads/1/3/2/7/132740669/xetiwa.pdfIn PDF document text
    • https://zojufagilazit.weebly.com/uploads/1/3/0/9/130969654/2806329.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sawanixum.pbworks.com/w/file/fetch/144521229/xagutalenawunudorizileban.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/happy_birthday_gif_with_sound_and_name.pdfIn PDF document text
    • http://pebenuziwi.pbworks.com/f/vcredist_x86.exe_2005_sp1.pdfIn PDF document text
    • http://gebozuj.pbworks.com/f/business_studies_class_11_book.pdfIn PDF document text
    • http://voluluzij.pbworks.com/f/business_expansion_plan_proposal_sample.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_off0000eff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 4804 bytes
SHA-256: a67a0318a83c4d638f22856f03873eaf54f237d82783aef295fb97db04fe79d0
font_01_sfnt_off00010048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 10688 bytes
SHA-256: 9de6df11fbdf82211eeb64b2c1ab4ec7cc7f3300f1ea80e99c743d2ba83bed9b