Malicious PDF — malware analysis report

Static analysis result for SHA-256 42eb0e84c6022495…

MALICIOUS

PDF

77.2 KB Created: 2021-03-29 21:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9d1bf6e0a259bd623fefc992ccfd7188 SHA-1: 4956ace4feea6c532baa823389921779d16ca7bc SHA-256: 42eb0e84c60224951a1ffae8da8e64f035e95f41243dce32a1e871e536080291
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 numerous embedded URLs pointing to disposable domains, suggesting a link farm or redirection mechanism for phishing or malware delivery. The document body, though heavily obfuscated, contains text related to 'how to throw doubles in darts', which is likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/strik?utm_term=how+to+throw+doubles+in+darts PDF link annotation
    • http://wugafis.66ghz.com/how_much_is_rosetta_stone_french.pdfIn PDF document text
    • http://ripelavezomosiv.iblogger.org/33546941963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500679/normal_60168c5f7df61.pdfIn PDF document text
    • http://miworusak.iblogger.org/destiny_2_all_black_armory_guide.pdfIn PDF document text
    • http://wirobigi.medianewsonline.com/17631956395.pdfIn PDF document text
    • http://datinge.site/moniwpzxaf.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/43434380745.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486354/normal_5ff4116a1d699.pdfIn PDF document text
    • http://xupulakikovuxo.mypressonline.com/pdf_accessibility_checker_title_failed.pdfIn PDF document text
    • http://napowojeba.medianewsonline.com/internationalization_of_philippine_higher_education.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/82901245977.pdfIn PDF document text
    • http://unonatur.space/150059083522brfp.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/mosoguvufokazixuj.pdfIn PDF document text
    • http://vashmaster.info/59077903481bgnkq.pdfIn PDF document text
    • http://dotenipago.medianewsonline.com/75762164312.pdfIn PDF document text
    • http://zavolofa.mygamesonline.org/15611761372.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fexeledusezeto.rf.gd/online_document_translator.pdfIn PDF document text
    • http://laxolagodofomug.onlinewebshop.net/debofenupike.pdfIn PDF document text
    • http://bikutuvuxaxixo.epizy.com/sujijoxunuguxirawupuno.pdfIn PDF document text
    • http://kakofuwogo.epizy.com/carrie_pilby_book.pdfIn PDF document text
    • http://nabotiwufonego.epizy.com/shepherd_bethel_chords.pdfIn PDF document text
    • http://pivimufe.atwebpages.com/77281952380.pdfIn PDF document text
    • http://nelodetasa.rf.gd/c_array_template_class.pdfIn PDF document text
    • http://sasomibaben.rf.gd/tizuguwezatelemubadepupam.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_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 5108 bytes
SHA-256: 191db361b89817770d19460728ecbff00e688bb990c16aaa07d0902b4cf3bca3
font_01_sfnt_off000104b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 10096 bytes
SHA-256: bcc2a9c61baf6ce2a0c983c3b54cdd1b468a5dca437ab589352f86526c3756fe

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