Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf37d38920235bb…

MALICIOUS

PDF

67.7 KB Created: 2020-12-09 00:53:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: da9ddc3e7a2be71deb8026d7ed4935b4 SHA-1: 212b88c5f264c42cad7e41030f157be7fc1c8705 SHA-256: 4bf37d38920235bb711e41263f6ab7c32ca1ab629d2c2fd7d17df62c77b5e530
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, identified as a link farm, with a deceptive title related to Bollywood movies. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a high volume of links hosted on disposable domains, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection further confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafficel.ru/strik?utm_term=fullmaza+bollywood+movies+in+hindi PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409425/normal_5fc4a1c2333b9.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/5069218.pdfIn PDF document text
    • https://girenofozajete.weebly.com/uploads/1/3/4/4/134476001/mujegosidemuga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490366/normal_5faa65a197abd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377697/normal_5f8fb64a7e626.pdfIn PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/80ae34400f2c6.pdfIn PDF document text
    • https://guboriratuji.weebly.com/uploads/1/3/4/2/134235556/nebagaweteme.pdfIn PDF document text
    • https://nodararikerat.weebly.com/uploads/1/3/4/8/134885074/pavumunabel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386365/normal_5f9cc8578a2b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403407/normal_5fb59498e86ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc7ad0e81da8a590db20c77/t/5fc9b21f2ae1264a038fc5e0/1607053856494/milizexogidasobivezowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81dac79e-9631-450a-b9a1-604d96affcc8/des_plaines_public_library_open.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d062f3f5-c3a6-4ca4-b159-145565654388/chemistry_the_physical_setting_answer_key.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_off0000cc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6E 5368 bytes
SHA-256: bd19a019541c748b9dc253c73376a676ad084c63eddbe1e57fc46c9396dfd619
font_01_sfnt_off0000dea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA6 10236 bytes
SHA-256: 7b6f231a341724726737c4cc8fa8d6f11d32a516ea143a20bc623217c47c22f9

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