Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3d128f1efc5a5c…

MALICIOUS

PDF

77.5 KB Created: 2021-02-19 16:57:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7bd8940b10bc484a0438b1b3491ab8d6 SHA-1: 5ef855deabb455fc13f633f341ebf85de037f35e SHA-256: 5c3d128f1efc5a5c0dd5f1f09830bec63191749eb12d9025a06fc59c81969100
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://jottigo.ru/strik?utm_term=remington+700+sps+tactical+aac-sd+review', is directly embedded and points to a suspicious domain. The ClamAV detection and ML classifier also indicate maliciousness, suggesting the document is designed to redirect users to potentially harmful content or phishing sites.

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 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://jottigo.ru/strik?utm_term=remington+700+sps+tactical+aac-sd+review PDF link annotation
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/9597474.pdfIn PDF document text
    • https://ribiridoxa.weebly.com/uploads/1/3/0/8/130874248/navozikupiti_pefegaxajodom.pdfIn PDF document text
    • https://mubatizusilaboj.weebly.com/uploads/1/3/4/4/134475350/0a0eead3.pdfIn PDF document text
    • https://cdn.sqhk.co/zabitokepum/mfidmu4/31423081859.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/ejcVFgi/mibafisavimo.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/tigovatolis/rusawuxuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/miworitakog.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/94940045405.pdfIn PDF document text
    • http://kesopepi.rf.gd/meromeluxenizexetizovika.pdfIn PDF document text
    • http://dejanubotikepiw.rf.gd/refokefekarajavoxovotige.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/kitixug.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/chrome_addons_for_android.pdfIn PDF document text
    • http://fujatelet.epizy.com/rurusejogurarababij.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/zasowadezutapam.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/flyer_layout_template.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/canon_5d4_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/powogateposit.pdfIn PDF document text
    • http://rovarede.rf.gd/android_paid_apps_free_apk.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_off0000edd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD5 5808 bytes
SHA-256: 80829a92292f5e29097cd6052d13004ad3387c89db72272eae9c795cdf74333e
font_01_sfnt_off000101a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 11388 bytes
SHA-256: baa60ab91f7496a6b73779019a1258ec3af17144e2e810cb53f8e4aa6b09e379

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