Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c04f93a285bb4b…

MALICIOUS

PDF

67.7 KB Created: 2021-02-02 19:02:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: 35e9df9027393757f6969bc747da6db4 SHA-1: 06f6f48afac51d33ad7bc02f01b886cd5c5bea18 SHA-256: f4c04f93a285bb4b8ffe2d76ba762eac045e32fe5ccb6ab7cf6ef7b43b174f6d
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/wb?keyword=lagu%20dusk%20till%20dawn%20cover%20violin PDF link annotation
    • https://vosojexurixug.weebly.com/uploads/1/3/1/0/131070535/8991014.pdfIn PDF document text
    • https://zedasadexim.weebly.com/uploads/1/3/0/7/130775923/2910256.pdfIn PDF document text
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/napugomi_gabotofor.pdfIn PDF document text
    • https://simujuzejopu.weebly.com/uploads/1/3/5/3/135305424/dudes.pdfIn PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/nopeletazag_sofudijatof_kuneju_dazemurigazo.pdfIn PDF document text
    • http://mamontov-net.cc/puganavafoxerawwaaxy.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/11405758151qeuvj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503791/normal_5fe5fa1f4f919.pdfIn PDF document text
    • https://dasezakam.weebly.com/uploads/1/3/4/8/134883145/5888012.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/common_aluminum_sheet_metal_thickness.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/old_betking_app.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/49060945903.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/windows_10_1903_time.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/informal_letter_writing_for_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/writing_task_2_band_9_collection.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_off0000cdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF7 5264 bytes
SHA-256: e5a6edc54d6755d5994d24d7b2a1c8e5fe5856831fa1c7ba2eb4c2f6b430268d
font_01_sfnt_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 9916 bytes
SHA-256: d49c1fc9966aaa437108c6e9db46e1030760928055b4ca5dffb1edd3e172df51