Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ef1d52d28f2870…

MALICIOUS

PDF

76.8 KB Created: 2021-02-12 23:00:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f1322fbe173a9445b689246dd150809e SHA-1: 3d1cfb33ec1f165f112477e34e298887214479b3 SHA-256: 74ef1d52d28f28703a1e6bffbb3b609c0643a7c8585d8f97dce7f8740f0d854f
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://jacksth.ru/wix?keyword=static+vs+dynamic+characters PDF link annotation
    • https://solugelefeko.weebly.com/uploads/1/3/0/7/130740562/datufozob-gibexujexi-lupiwi-xoxagujasokone.pdfIn PDF document text
    • https://cdn.sqhk.co/fofubulami/hdjedie/drift_clash_mod.pdfIn PDF document text
    • https://vedaputenada.weebly.com/uploads/1/3/5/3/135318287/busapesevodup_vovozafedewe_jajuzolitopav_nusofogopexexel.pdfIn PDF document text
    • https://luwupedo.weebly.com/uploads/1/3/1/3/131383743/45df510.pdfIn PDF document text
    • https://bozuwosumexoxal.weebly.com/uploads/1/3/2/6/132682772/porojaxoxi-kerugewewurag-vaxip-dobobanujumif.pdfIn PDF document text
    • https://cdn.sqhk.co/gasukatebu/hEHmn9z/71425221784.pdfIn PDF document text
    • https://kuxelozipapim.weebly.com/uploads/1/3/1/8/131871637/7851446.pdfIn PDF document text
    • https://linabodaku.weebly.com/uploads/1/3/1/1/131164293/c6c8b65c.pdfIn PDF document text
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/mewino-wulemonakud-lugelemefiri.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/tidigudetefumof/81827083325.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/77851443131.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/barish_ki_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/xedit.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/comment_form_template_html.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/there_are_more_questions_than_answers_song.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/demography_preston.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/kasoginib.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/tasamibanujamovajev.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/pufuxaropejum.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/98693440673.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_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 5412 bytes
SHA-256: 0df94a1831e8941ecf3c422441e88127aa051bbe0e6a67ef71e40aa2100d8463
font_01_sfnt_off00010157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10157 10792 bytes
SHA-256: 25397e7e3e8446254d47d50e80520ffedb1cfa45f665ec4d41afaad7d2848764

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