Malicious PDF — malware analysis report

Static analysis result for SHA-256 895fffe4759ee81b…

MALICIOUS

PDF

77.9 KB Created: 2020-12-24 11:28:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4a7e1b220d4998aa44d962304b8b210e SHA-1: a7b7aa554dad8c5771841fd57e02011c36d458c6 SHA-256: 895fffe4759ee81b3e38c675c902cbe57f61870bfba5ce140d36d6d48c436531
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent external URI, 'https://trafficel.ru/123?utm_term=minecraft+traveling+merchant+skin', is a strong indicator of malicious intent, likely leading to a phishing or malware download site. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/123?utm_term=minecraft+traveling+merchant+skin PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409811/normal_5f97ea391ffeb.pdfIn PDF document text
    • https://molireju.weebly.com/uploads/1/3/4/6/134630509/80bb7f8b6c5da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392660/normal_5fd945616326d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372378/normal_5fe0d0b5d0774.pdfIn PDF document text
    • https://cdn.sqhk.co/jibenapola/Mjchnmm/occupational_health_center_pascagoula_ms.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/bf693ce5-b021-42cc-b1e3-f10b32427a70/learned_vs_learnt_australian_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3585b55-5f58-4eed-88c7-5f942981ba94/45385098355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c39e07cb-7f2f-4e8e-94fe-5932f8d61bf8/5184340772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1e07d44-51d7-44ee-a665-085e72fab967/81140680054.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/xuvorusar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb88b1c2-56c6-465c-a164-00322477aef4/1460774974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f890c4f0-6e58-4a2a-a53a-93700df63e09/24440838766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/204aeff4-ce8b-423a-918b-1fa781ebb15e/83749362792.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77C 4680 bytes
SHA-256: 53ae7cb0e137c857db9310d77bf74cc7df2a2d7c07f56cbbae4daefeece32cf2
font_01_sfnt_off0000d81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 5424 bytes
SHA-256: 2f84b90a6782a9b8b964e3f92b0c79af68e3b45895cf84b3bbfc7fb2452b30d2
font_02_sfnt_off0000ea7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 13064 bytes
SHA-256: c57c5056979b2e1a0c74cc75575f7e1572705d3f0a9828de6c26dda2a3e2ecf6
font_03_sfnt_off0001153b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153B 16116 bytes
SHA-256: 2a2db4f559f0f229cac65bcb4282087702fcdd9ff4c269c0872b13e038302a49

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