Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4e9ee7ba4111a4…

MALICIOUS

PDF

75.3 KB Created: 2021-05-30 00:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d5070c8ce453513e0459f3c6163203e2 SHA-1: b09261af9fd7e5940b58f1aa708b8c5905a24f16 SHA-256: ca4e9ee7ba4111a4effd853c0d34dc707d00a4046c2419861dea7999ec92ca3b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://golowaki.ru/strik?utm_term=diabetes+treatment+algorithm+2019+uk, which is likely used to deliver a secondary payload or redirect to a phishing site.

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://golowaki.ru/strik?utm_term=diabetes+treatment+algorithm+2019+uk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393208/normal_5fe6b2f6e37df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462059/normal_6035b6ef95848.pdfIn PDF document text
    • https://pizupunaj.weebly.com/uploads/1/3/1/4/131406403/79118.pdfIn PDF document text
    • https://ruvikofaxum.weebly.com/uploads/1/3/1/3/131380889/jukapebosokin-nivilinidu-rosomumijo-mebebebotan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457272/normal_60386f7f2c9ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413005/normal_5fee001fbf841.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417414/normal_600d25fdccffe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486778/normal_5fe3dc4566e89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485689/normal_600012ce5c3db.pdfIn PDF document text
    • https://xiworibamenu.weebly.com/uploads/1/3/4/7/134728691/5549319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476758/normal_602a1a3b25bd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470385/normal_601e1be0ad997.pdfIn PDF document text
    • https://kimuximufa.weebly.com/uploads/1/3/4/1/134132687/jigodidefel-noxuwobotidip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376849/normal_600fc3887dc51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495685/normal_5fcc21355431a.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/b4e892eb-832e-42df-8c6f-67e74ed8dd48/honeywell_1981i_barcode_scanner_programming_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2057471e-48cc-4be5-b6ba-4a2abfbc8f65/rosemount_3051tg_sil_certificate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fac3613-824b-49fe-8614-7779bb2a4a02/naruto_3rd_databook_stats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0754b762-e705-4069-af89-2a8684a73e28/the_art_of_destiny_child.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7720ef5-13fa-44dc-998b-188457b0d5e9/information_technology_manager_degree_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/291b81c5-b37b-4c8b-a84a-0a1511d615c9/john_deere_318_garden_tractor_prices.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_off0000e5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 5784 bytes
SHA-256: 8a47d4ef039d2d735223423dcca05face4f57ecb19d2ca406ff231e2909ede1b
font_01_sfnt_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 10856 bytes
SHA-256: 21243eb0c65c01ab4d85396f6a07a1a05ffe736cdc1f55bffd5affa548667eb1

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