Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3dadc653f7cbb01…

MALICIOUS

PDF

75.6 KB Created: 2021-05-30 13:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c3899bc887d16710a1c9084975905874 SHA-1: b1685ab770913c12b2b8fb6e82422d7f48c1037d SHA-256: d3dadc653f7cbb0166411b438f87d92cec374c9c215a029d6b96e5acf412f574
244 Risk Score

Malware Insights

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

The PDF contains a large number of links to external PDF files hosted on disposable domains, indicative of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dafemum.ru/123?utm_term=assassin%2527+s+creed+odyssey+trophy+guide+psn In PDF document text
    • https://xusemiwo.weebly.com/uploads/1/3/4/8/134899199/268d5208.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368485/normal_5ff00f9a1a423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485305/normal_6018ed66df68a.pdfIn PDF document text
    • https://zisuwurelexutik.weebly.com/uploads/1/3/4/6/134668326/suxunimujosu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409421/normal_5fe18cd443519.pdfIn PDF document text
    • https://gufurokis.weebly.com/uploads/1/3/1/4/131453316/pobolo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_60311f7ea7b61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486053/normal_5fcaee5ac3a8a.pdfIn PDF document text
    • https://ledobosu.weebly.com/uploads/1/3/1/3/131383424/fafexadasefapog.pdfIn PDF document text
    • https://puxipevabama.weebly.com/uploads/1/3/4/3/134308905/fumala_lipijumorezu_befoj.pdfIn PDF document text
    • https://kubududowu.weebly.com/uploads/1/3/5/3/135349078/c697941f8bdef9.pdfIn PDF document text
    • https://xatawozenovug.weebly.com/uploads/1/3/4/8/134886035/zukumizip-peparoke-lajonaxe.pdfIn PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/laxapake.pdfIn PDF document text
    • https://tekovotobu.weebly.com/uploads/1/3/5/3/135319939/febabubulovasul.pdfIn PDF document text
    • https://gumewixolasadaz.weebly.com/uploads/1/3/4/6/134659592/zunuwumisuwabiso.pdfIn PDF document text
    • https://wumigafilik.weebly.com/uploads/1/3/4/4/134492391/siruxitupe.pdfIn PDF document text
    • https://gajorimimexawi.weebly.com/uploads/1/3/4/4/134458849/a7039584da6.pdfIn PDF document text
    • https://xaredoluvowa.weebly.com/uploads/1/3/1/8/131871785/9488654.pdfIn PDF document text
    • https://koberowebajufom.weebly.com/uploads/1/3/4/0/134096943/fewibinej_sivasim_zudikexubofov_xepagazukuxege.pdfIn PDF document text
    • https://vomuzubedabop.weebly.com/uploads/1/3/0/9/130969103/755d2f.pdfIn PDF document text
    • https://narobukedezupe.weebly.com/uploads/1/3/0/7/130738621/61a330985ccd66.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/a053bd0c-6122-476d-808d-ed0734e46913/shoei_neotec_2_splicer_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/544eab3a-82e1-4136-8d39-f0e5b5265325/2009184029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e580127-58f1-4079-8c74-ffc8a36f24ea/varalago.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_off0000e6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AA 5428 bytes
SHA-256: 59bc91bf68a72e1984296bdb7d88d730371ed6604e972cd6d5bb2d1f62c536a4
font_01_sfnt_off0000f92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92A 11120 bytes
SHA-256: a9dcf373fe88e93c35e0e71e4a1865b53b4528f9c46f436e02db3c3f9d5a3a73