Malicious PDF — malware analysis report

Static analysis result for SHA-256 c093c0c1282211d3…

MALICIOUS

PDF

89.8 KB Created: 2021-02-25 22:10:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 144bc9e88c9455bebcd7a8e819f3fcc1 SHA-1: 47bbd4b6e262f92e2f640105cccf100e08c7dc7e SHA-256: c093c0c1282211d357219be3feb30b8c70f133eaabaeb41214184508743d444d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting and link farms, indicating a likely attempt to redirect users to malicious content or phishing sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=new+rules+of+lifting+supercharged+workout+sheets PDF link annotation
    • https://fumaletaseker.weebly.com/uploads/1/3/1/3/131381433/4f3dcc0c8f824.pdfIn PDF document text
    • http://chelobaka.space/dusukixy1m0l.pdfIn PDF document text
    • http://c-advance.space/download_drag_n_boom_mod_apk38yth.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/arduino_ide_linux_serial_port.pdfIn PDF document text
    • http://50off.pro/23274979306yo1cy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475989/normal_6031be249c7ce.pdfIn PDF document text
    • http://www-sfr-fr-monespace.com/autometrica_septiembre_20209xwxh.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/jatoduxarelujup.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/ic79MCU/mobulukerubutemezobaji.pdfIn PDF document text
    • http://importants.space/wapeniwitufugovirims04lq.pdfIn PDF document text
    • http://fb-pageunderreview.com/82240082572d8cv2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416664/normal_5fd17d7d358dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417525/normal_5fe59cc303d64.pdfIn PDF document text
    • http://mandarin-fruit.space/how_to_identify_inferential_statisticsgyue2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501045/normal_601378b3f04f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://petojijoxura.onlinewebshop.net/voxeguret.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_off000122df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DF 5544 bytes
SHA-256: 51922260411bf78aecf8e10f7f717db39de5821c03f3252f083425fe8ee7374e
font_01_sfnt_off000135cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CF 10492 bytes
SHA-256: 86dcd8dbd4c0f6ed6c011ce2761474c819efa68bf20542bfde6c7404585a89f0

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