Malicious PDF — malware analysis report

Static analysis result for SHA-256 30081a0f2d4329d8…

MALICIOUS

PDF

70.2 KB Created: 2021-05-30 01:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c6ffe03c3494b9438f2498d62d6d6e45 SHA-1: 2b3e66f7e9cc62f542192892e3ae8d8dbe28e109 SHA-256: 30081a0f2d4329d80e9afbf4a362238436915ae9f1f742c38be4f8e48198e652
244 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on disposable domains or known malicious redirectors. The heuristic firings indicate a link farm designed to redirect users to malicious infrastructure, specifically mentioning a link to 'yafferge.ru'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=print+color+pdf+pages In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411246/normal_605655421b8c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529977/normal_6055ff162c092.pdfIn PDF document text
    • https://wozomeki.weebly.com/uploads/1/3/0/7/130776066/vuguzezumi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380523/normal_5ff70f624c34c.pdfIn PDF document text
    • https://gokaletuwatuni.weebly.com/uploads/1/3/6/0/136098233/9643628.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388422/normal_6007fa4e9a5c4.pdfIn PDF document text
    • https://kolivobaka.weebly.com/uploads/1/3/4/5/134500933/xilopewizep_talitakukazejev_kexiliwefebip_taforolopew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381321/normal_5fd05c16e1b05.pdfIn PDF document text
    • https://ragojozuzaz.weebly.com/uploads/1/3/4/6/134668900/tegoluzep_raxifadadulife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390660/normal_6025a5250a197.pdfIn PDF document text
    • https://tenaxegib.weebly.com/uploads/1/3/4/5/134583113/xowevofeve.pdfIn PDF document text
    • https://punerumoluzes.weebly.com/uploads/1/3/4/8/134897399/a7093e2e8b.pdfIn PDF document text
    • https://ratanamiwul.weebly.com/uploads/1/3/4/3/134327333/ce1ea8c13d2.pdfIn PDF document text
    • https://sitixibabu.weebly.com/uploads/1/3/4/7/134749551/madefotadu_mupagakulatexi.pdfIn PDF document text
    • https://bafokaxaxex.weebly.com/uploads/1/3/4/8/134881351/lekifafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475727/normal_602ef6a9ada63.pdfIn PDF document text
    • https://ramenenute.weebly.com/uploads/1/3/4/5/134591972/8f1b0d8a26.pdfIn PDF document text
    • https://gikanusubidi.weebly.com/uploads/1/3/4/7/134756500/pamobivunajizizage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375518/normal_600e1da03cc6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471995/normal_5fddb2efc2eb4.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/0be13890-5f53-4b0a-bbf4-b9050a4a766b/27181131741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca6f79ca-475c-4847-b1a9-76eefad42739/gusak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bbe6fb7-0f56-446e-ad2e-3d1e8554adbf/58897392174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/027857d8-b9a9-4c96-93d3-acc959cdadd7/29101772980.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_off0000d6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F6 5324 bytes
SHA-256: 6f49aaa40cb1f2980119b655b101011c5a5e2a5a8111483e9137535df7c18da0
font_01_sfnt_off0000e923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 10120 bytes
SHA-256: f3c440b71f8ac8e3d0997f02d7c64e6d87f9902721f8ca51c17d2ea184879ba0

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