Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd11d7e918e7c917…

MALICIOUS

PDF

73.4 KB Created: 2021-05-03 12:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6d677bcc0d043b4173d1f6c627ac7c89 SHA-1: edafbdc183a9c842197c232807fd7f0a01796016 SHA-256: bd11d7e918e7c9170bb6e43b7179626d1bd5e0a120cd92d117753e14520d2171
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as https://vilenefex.ru/strik?utm_term=hp+laserjet+1320n+toner+amazon, are likely part of this distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://vilenefex.ru/strik?utm_term=hp+laserjet+1320n+toner+amazon PDF link annotation
    • https://ruzudewalaxuge.weebly.com/uploads/1/3/4/4/134497745/xuxelifuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412895/normal_5fdd722f663d4.pdfIn PDF document text
    • http://prizyivnik.ru/subumitovaga8oyks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446789/normal_602d95f57ca78.pdfIn PDF document text
    • https://safuziketuxoxu.weebly.com/uploads/1/3/0/8/130814855/ximena-vavojexinagepa.pdfIn PDF document text
    • https://fikelepokaretes.weebly.com/uploads/1/3/1/3/131397971/wigaro.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/ghPjdgh/48140333414.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/RGjcjjM/51244657432.pdfIn PDF document text
    • http://swiss-gear.store/hp_elitebook_8440p_price_in_bdznelp.pdfIn PDF document text
    • http://snt-br.ru/vox_ac30_head_cabinetq51tf.pdfIn PDF document text
    • https://cdn.sqhk.co/pibexezases/jjgifie/87576395348.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/35970273-139c-426f-8269-e17883e4e14c/67033161945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/713fcd3d-b6b9-4024-b58f-984850534deb/44675800626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b748a505-364e-43c8-b0c5-6292a1b12b90/78251240208.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1887a6c0-09fa-4027-a3ba-c655d24af02a/smartparts_digital_picture_frame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5883f8b8-8528-4ef0-a900-0bbcd7987037/guy_de_maupassant_the_necklace.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_off0000e0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FB 5544 bytes
SHA-256: 394452a739f93e620c98a899794a7d1c304a0192e4b375ac8e79c7d13293c467
font_01_sfnt_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 10912 bytes
SHA-256: cca7ecc291026a9d171e112a84f7345ff218d6644ce0bbbc45f6fd9c7fc23456

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