Malicious PDF — malware analysis report

Static analysis result for SHA-256 08313fd5ff92e652…

MALICIOUS

PDF

88.9 KB Created: 2021-04-04 17:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3153b9f6d8318c8bcdc020f0be779c92 SHA-1: a920017c0eb61bd94073dd95559b2262b6a94738 SHA-256: 08313fd5ff92e6526731f30e1f80d2e35b857f32bee1858aa26ab69fcc6481f7
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content or phishing lures. The ClamAV detection and ML classifier further support its malicious nature. The primary IOCs are the redirector URL and a representative link farm URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/strik?utm_term=sundara+kandam+pdf+in+english In PDF document text
    • http://dupamineni.medianewsonline.com/corrugated_box_design.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446390/normal_5fff6ff579fc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413462/normal_606060e14597e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481839/normal_5fdeade96050d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452374/normal_6059021c7f0d0.pdfIn PDF document text
    • http://gelokan.sportsontheweb.net/76266808693.pdfIn PDF document text
    • http://redit.fun/amc_10_b_20184nndz.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/rejodipig9gtz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_db522ea5ed344920a348dc6155bf891a.pdf?index=trueIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_c753eb3c036541f0aa37e000cc856043.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_f14fc87eb9ce48b48496174a66ddaa35.pdf?index=trueIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_373e6984de8f4591b5213f9a6d0ec22d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/rajixafezitepixujo.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/20899853295.pdfIn PDF document text
    • http://juwukopegonamu.onlinewebshop.net/79553234177.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_14509a913e9c44359751247de84a0ad7.pdf?index=trueIn PDF document text
    • https://d0f5cf02-e55f-42e7-ba97-8a4d5a2b8368.filesusr.com/ugd/7f59a0_6bea69d9fe234a7c94fe93116190094b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/44818314724.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_ef2edcfbeb2f44bc9452f24b273e9aae.pdf?index=trueIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_76b5a65288c24119b5f4abc28ded1d5c.pdf?index=trueIn PDF document text
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_117ceb686ce0409cac8b5632085a08fb.pdf?index=trueIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 5620 bytes
SHA-256: cb39042cbb07cf5ae552d276ccf0f8058589af0183e1764ce5dda48176e33ccd
font_01_sfnt_off0000f42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42B 2656 bytes
SHA-256: dbaab8dcf32bfe64cb008f34eb54f5316f62236e8dffe3de49b44225404383a5
font_02_sfnt_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 2328 bytes
SHA-256: 864cbe2c6973b44d2b71e19ffbffb2328dcb3759b07ceb43c11d5a372fc4956d
font_03_sfnt_off000109e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E5 6040 bytes
SHA-256: fd0b04068c433ffeff709479ec080f770924340e101b50041742adadea665972
font_04_sfnt_off00011d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D16 12780 bytes
SHA-256: 056c31175e6faf17cb9b2e8b7ebdcd16d384131b7e9d785fcc10f498ca4d98b3
font_05_sfnt_off000145aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145AA 3772 bytes
SHA-256: 004768ed623ae61a93baf21de081175f14cd4750b99975f668196e473dabbd16

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