Malicious PDF — malware analysis report

Static analysis result for SHA-256 308b5b56e358989c…

MALICIOUS

PDF

83.4 KB Created: 2021-06-12 05:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5612e0bac925107db6effee7c16fd03 SHA-1: 69f866910bce03bf0c4f3da134e83fe327cd0347 SHA-256: 308b5b56e358989c4cc28ae9366ceb4728936f2f85199462a1ce5c09fb23d37f
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, with one prominent URL pointing to a potentially malicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the structure and URL distribution suggest an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://oniceh.ru/pbw?utm_term=naruto+shippuden+ninja+storm+3+ppsspp
    • https://static.s123-cdn-static.com/uploads/4452374/normal_60046cd4f2775.pdf
    • https://cdn-cms.f-static.net/uploads/4458394/normal_6026029e3a2c2.pdf
    • https://cdn-cms.f-static.net/uploads/4500453/normal_5fd1957578b91.pdf
    • https://weluperexofabed.weebly.com/uploads/1/3/5/3/135382791/9816560.pdf
    • https://static.s123-cdn-static-d.com/uploads/4379723/normal_60b74fdfc29ca.pdf
    • https://static.s123-cdn-static-d.com/uploads/4419847/normal_60b1427166003.pdf
    • https://rawutakoze.weebly.com/uploads/1/3/4/3/134326806/f9cb8.pdf
    • https://widobane.weebly.com/uploads/1/3/4/3/134340358/kitefut_xagojax.pdf
    • https://degodowaserujes.weebly.com/uploads/1/3/4/4/134494515/da2f3aa671.pdf
    • https://bedamenupal.weebly.com/uploads/1/3/4/7/134721947/ce07266768c70e.pdf
    • https://samibogamo.weebly.com/uploads/1/3/4/8/134883552/0259bbc27449.pdf
    • https://static.s123-cdn-static.com/uploads/4480414/normal_5ff7f2711ba10.pdf
    • https://wolemokopafono.weebly.com/uploads/1/3/4/4/134460240/pepemereme_nesesexararofu.pdf
    • https://sadozilodefizon.weebly.com/uploads/1/3/4/6/134659806/7560242.pdf
    • https://cdn-cms.f-static.net/uploads/4475577/normal_6043584bbf712.pdf
    • https://razosopowob.weebly.com/uploads/1/3/4/5/134509902/2c04eeb1234.pdf
    • https://cdn-cms.f-static.net/uploads/4485153/normal_5fd67ef31ca50.pdf
    • https://cdn-cms.f-static.net/uploads/4427274/normal_601630d2987f7.pdf
    • https://cdn-cms.f-static.net/uploads/4377410/normal_605bfe5e3f4bf.pdf
    • https://cdn-cms.f-static.net/uploads/4410201/normal_602026168a46f.pdf
    • https://cdn-cms.f-static.net/uploads/4405430/normal_601881d40c4b0.pdf
    • https://cdn-cms.f-static.net/uploads/4500883/normal_5fdb6e904755f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9886fa56-5071-4127-86ac-d350574f49bb/how_do_you_turn_on_your_sprinkler_system.pdf
    • https://uploads.strikinglycdn.com/files/573358bf-083e-446e-93cf-f1a2dd1d80c5/how_to_login_to_echo_show.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010460.bin
b85c5294421d94e282dcaab8e9842046c1e87b68576f4d6cd140299b451da9f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 5376 bytes
font_01_sfnt_off0001168e.bin
809bc1af1a3935f1fed6aae70d70587c5cc12970005ab8e197eeee3b0d370b08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1168E 13096 bytes

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