Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b13a7f66bd3288e…

MALICIOUS

PDF

77.1 KB Created: 2021-03-23 00:14:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7686634875aa947f9ef0ac9fd722d4ea SHA-1: 1e7521cdcadcc578db63cd97eae3adff945bf6a4 SHA-256: 7b13a7f66bd3288edc857794bc2cd00db17010cea412ed2c1868f62d27c9a1cc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized to appear as legitimate documents, but are likely part of a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://kuzutuzo.ru/wix?keyword=music+theory+intervals+worksheet+pdf PDF link annotation
    • https://dikurowewo.weebly.com/uploads/1/3/4/8/134893632/660629.pdfIn PDF document text
    • https://cdn.sqhk.co/lexebogefaj/hjijiBB/xijoxidufisu.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/gj1n0F0/lidevotapepatosuxivunu.pdfIn PDF document text
    • https://cdn.sqhk.co/pofoxubo/hf0qiaO/.pdfIn PDF document text
    • https://mujolimu.weebly.com/uploads/1/3/4/8/134868529/varun.pdfIn PDF document text
    • https://rosififobagas.weebly.com/uploads/1/3/1/1/131164218/sedip_gefovifoga.pdfIn PDF document text
    • https://monowulesamewul.weebly.com/uploads/1/3/2/6/132682048/1315780.pdfIn PDF document text
    • http://wegutamozeji.iblogger.org/suzololozelenos.pdfIn PDF document text
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/vinor.pdfIn PDF document text
    • http://xidakuxekon.22web.org/44199876538.pdfIn PDF document text
    • https://rinulokol.weebly.com/uploads/1/3/4/8/134868038/tiseroguka.pdfIn PDF document text
    • http://tapabafana.22web.org/klasifikasi_centrosema_pubescens.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/wetevali/apoorva_raagangal_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/bradford_city_fire_news_report.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/santa_cruz_hightower_lt_chain_guide.pdfIn PDF document text
    • http://jeronegiwok.rf.gd/java_8_offline_installer_64_bit.pdfIn PDF document text
    • http://misowajonubajoz.epizy.com/ronifafajovade.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/xolusaxakuzijebiwodigeri.pdfIn PDF document text
    • http://sijelufuzarolup.epizy.com/express_dress_shirt_fit_guide.pdfIn PDF document text
    • http://pukupufiribeja.epizy.com/rawobixatuzapumev.pdfIn PDF document text
    • http://volegurez.rf.gd/sex_education_season_2_ending_explained_hindi.pdfIn PDF document text
    • http://nepogewapiw.epizy.com/ladekedamaniged.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/federalism_and_ethnic_conflict_in_ethiopia.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_off0000eb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB18 5564 bytes
SHA-256: 5b5d3c317aa0fff0ae4951301b85b58c67f2e743d8b4f59836942f425a75e12d
font_01_sfnt_off0000fe2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2C 12480 bytes
SHA-256: f22b0243938a31ff089b1b30f7d9ee5cc062cf178c02864caaf058c632c7d8c8

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