Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8be30674036a1b…

MALICIOUS

PDF

70.8 KB Created: 2020-12-05 19:03:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5dbfe2ea0c6a4905d14830ba117cd09a SHA-1: 2c42ebde4714680ef4ec5329dda55f45470ac1d6 SHA-256: ec8be30674036a1bdbdcbc96bab6d7f0fe02bc7b410841eafb132cb0ba41a4c7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' containing 28 external links. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=escala+cromatica+piano+pdf PDF link annotation
    • https://vobelerevofago.weebly.com/uploads/1/3/4/5/134596527/jufizujuzupisar-bedumelujojo-visominewama-gadegifubuka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_5f9d6ec936b9c.pdfIn PDF document text
    • https://gilawigegazimo.weebly.com/uploads/1/3/4/5/134520665/juzutorodu.pdfIn PDF document text
    • https://dowikawi.weebly.com/uploads/1/3/4/7/134741621/725710.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/523fb692-9499-4869-8264-e5db2c4a18cc/lanoninuvazidus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23122880-0d4a-41b8-808c-81466a9b4982/el_verbo_tener_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc17ddbf9866f3fd2d885d9/t/5fc3bed03570fb44d17562cd/1606663888888/6977939906.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6d48cd64a3343a5f4b73b/t/5fcadf2264036b6143817b02/1607130914887/atif_aslam_mp3_song_online_play.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ff4c16-16d1-416b-8d65-ef7d5b60ce64/mosquito_magnet_service_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d0065e8e827d428d60b5/t/5fc227c4f8cdb769c62c4777/1606559685049/logiwepubibemorerixun.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0df209955c744b53b696b/t/5fc17137145a8629dce73ecb/1606512952217/asphalt_9_soundtrack_spotify.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f19e9936-e235-4162-8cdd-c2bed5824f57/5137455070.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0d117acac6192a87df2d/1606290708916/10246382143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0460109-3d78-448a-8b35-77c3cb928785/indiana_frat_tiers.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_off0000d6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A2 5256 bytes
SHA-256: 9cb597c2b1c0cd12608b2db6c73e2cdc46d4d0bb65259988fde143753520a9a5
font_01_sfnt_off0000e86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86E 11492 bytes
SHA-256: 2aeb905b2356b6730a76056ba6b7a753f9321941cf75d7a6f05391715f5fbc02

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