Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef60954dc3390d3…

MALICIOUS

PDF

77.1 KB Created: 2021-04-15 22:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b62265a5b37039c312dc0b8a29462eef SHA-1: 50b88dd585ba636d13f9fe04d5dba7568381545b SHA-256: 1ef60954dc3390d3e3722a4b75fc5a1d8e527f1b9ea62ca7fe71b44d259c95e5
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://druttle.ru/strik?utm_term=rationalist+explanations+for+war+pdf PDF link annotation
    • https://megigoxifiwovom.weebly.com/uploads/1/3/0/7/130740625/sovetufaje.pdfIn PDF document text
    • https://pofifeluvoka.weebly.com/uploads/1/3/0/7/130739131/vakaxokuzunexa.pdfIn PDF document text
    • https://wudatoguji.weebly.com/uploads/1/3/4/8/134885495/xolikewapameref.pdfIn PDF document text
    • http://liwadaxezaf.getenjoyment.net/el_extranjero_albert_camus_gratis.pdfIn PDF document text
    • http://weporobedamebu.22web.org/zotevonizuxo.pdfIn PDF document text
    • http://fuvufurewuf.iblogger.org/10740522849.pdfIn PDF document text
    • http://desajegurake.scienceontheweb.net/xofadiwatulas.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/aparato_digestivo_generalidades.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_bbd0180e8a234b479e3dc55f5dda48aa.pdf?index=trueIn PDF document text
    • http://gitexilamivori.epizy.com/37944438603.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/30466883977.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/agreement_of_sale_of_land_format.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/devifux.pdfIn PDF document text
    • https://51fa5ab5-1254-4b81-b04c-93bf5fb5640a.filesusr.com/ugd/a58502_284f7915c1ce46cfb90f5a3228d10615.pdf?index=trueIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_dc82233d3f70421ba7ec3f3a72041d31.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/rasepipaxorufixeponurekir.pdfIn PDF document text
    • http://gifixutazopoja.epizy.com/51155389368.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/bodyweight_back_exercises_without_pull_up_bar.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/jardim_botanico_curitiba_esta_em_reforma.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/80987605075.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_off0000ef69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF69 5200 bytes
SHA-256: 836576b162d2477c2a3134a7c694fa9ecbfc8d1dc846dfced42a0ab200967f96
font_01_sfnt_off00010148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10148 11220 bytes
SHA-256: b25ed8d023c093243ca04ce0195fe44b374a333958566ff3c90cc146b3dce199

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