Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4810ebe81e0f53…

MALICIOUS

PDF

78.0 KB Created: 2021-01-02 21:49:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e0a5c87cb096f6e2f7b382c649cfd93e SHA-1: 4422ff0aab3343437b2c32f9287a6c3913f917ab SHA-256: fc4810ebe81e0f53ac8599fe2824124af043566877a67a7dbf2fe93d51afb7e0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://trafffi.ru/123?utm_term=stats+modeling+the+world+5th+edition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384048/normal_5f8c1d535c138.pdfIn PDF document text
    • https://cdn.sqhk.co/gitopedevid/LpKBKhf/gestion_de_pharmacie.pdfIn PDF document text
    • https://valezofijamope.weebly.com/uploads/1/3/4/4/134445284/rupikuze-wovalekazosimib-relime-jagixop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452381/normal_5fd350ff58ce9.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/d7gejc5/all_star_weekend_basketball_shoes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ee635877-0fa5-420e-ac63-bbc838de6fd0/29776063735.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/98329626050.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/customs_canada_form.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/pathophysiology_of_liver_disease.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efd007ef-2fa2-432a-9921-966018b98c95/83245766859.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/amazon_forest_fire_information_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/coding_guidelines_for_annual_physical_exam.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/zudapu.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/co2_laser_construction_and_working.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/47393192899.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE342 5348 bytes
SHA-256: b3ee7b5a68ad0dcc60111e3a890d28945d4218170fb49114ef134dec4f4cd9a4
font_01_sfnt_off0000f543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF543 11504 bytes
SHA-256: 68634710a909d85c10b043d5702e84bf627f65205f68d30c8687121a777f64dc
font_02_sfnt_off00011c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C65 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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