Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f9e4515a39b04b…

MALICIOUS

PDF

74.0 KB Created: 2021-02-19 07:53:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5ecb0fa5e1fc9c42ccfa089991265616 SHA-1: 14595b7e18589aae38d5ec687398d33aa547e780 SHA-256: 92f9e4515a39b04bc8fa032d03f034fa22ca42dbebc6b2ffe5e5d065d1cb8f93
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 to suspicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'aptoide build prop apk download', indicating a lure for software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=aptoide+build+prop+apk+download PDF link annotation
    • https://mepodatadun.weebly.com/uploads/1/3/1/4/131452799/gatenesodajij-kivapopepuzujis.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/gjhiynQ/ant_factory_max_level.pdfIn PDF document text
    • https://cdn.sqhk.co/bukoxomule/fq1hhsY/25990287761.pdfIn PDF document text
    • https://cdn.sqhk.co/jugomuzuteb/jhghzja/juzexusuroxolal.pdfIn PDF document text
    • http://bit-ipo.ru/gesuwukdjgf.pdfIn PDF document text
    • http://discount50it.pro/xujejorakusbplj.pdfIn PDF document text
    • http://islemleriniz.org/blender_how_to_do_rotation_animation26fc4.pdfIn PDF document text
    • https://wunovolal.weebly.com/uploads/1/3/5/3/135311751/furibifewijek.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/SgcjaeS/wurefobilim.pdfIn PDF document text
    • https://xivimuwujaka.weebly.com/uploads/1/3/4/4/134440816/4636796.pdfIn PDF document text
    • https://fuviwezajoz.weebly.com/uploads/1/3/1/3/131379384/cf05ec2ca3f3480.pdfIn PDF document text
    • https://cdn.sqhk.co/xunixenovapi/BkjfSqv/prop_hunt_fortnite_code_beach.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/xipavir/gegejebemineginulebelin.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/70277616992.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/87074529997.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/46864456326.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/marketing_plan_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/tutorial_drawing_anime_naruto_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/game_real_football_2019_java_320x240.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/aws_firehose_lambda_transform.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09B 5060 bytes
SHA-256: 0696e44fc4cd713e43022a5cc04b34a9867a20a7793db4495ca22cbc5ebc8c36
font_01_sfnt_off0000e1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 10468 bytes
SHA-256: 1327ae56cc144e345aa88b634101c76fa571ff1eda4eb96bfafb6432d4cd38dc
font_02_sfnt_off000105e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E1 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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