Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a851f1483047056…

MALICIOUS

PDF

73.8 KB Created: 2021-02-08 04:29:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: fe590f81d59fb1924a3eb51d9f80a464 SHA-1: df78c7ec420d6e1948ef272d2ee5e2025802bd54 SHA-256: 7a851f14830470563b2b209e22bed95aa8e3daf09f7a04b0279010c6f28fe7f1
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://seumenha.ru/aws?utm_term=paper+chromatography+post+lab+questions+answers PDF link annotation
    • https://ruzizoradum.weebly.com/uploads/1/3/4/3/134317959/b8640390499245a.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/PFgigf6/19463885649.pdfIn PDF document text
    • https://viwosakizipisot.weebly.com/uploads/1/3/5/3/135321869/985918.pdfIn PDF document text
    • https://mifimixaxenerut.weebly.com/uploads/1/3/3/9/133999571/labaxatodomefexegiwi.pdfIn PDF document text
    • https://zexirajeroluwub.weebly.com/uploads/1/3/4/8/134848753/pewizatazeka.pdfIn PDF document text
    • https://cdn.sqhk.co/bumogebiz/sihQigG/black_short_hair_cuts_natural.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/bubisifapagefe/alexa_app_for_windows_8._1_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/69309651428.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/htmlwebpackplugin_template_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/voruforati.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/jukanasarujekipedozojaso.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/bipozesan.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/favojos.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/38620601097.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/46422323877.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_off0000e19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19A 5808 bytes
SHA-256: b02096e3cf69d6f0fb0ab70d8ce6d2121d12435658bac74e4264a3f7c4afc545
font_01_sfnt_off0000f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 10764 bytes
SHA-256: ccc2a0c9915e1bf42258aadce52ca2a6d2cb3244e75e5ed412d6044c84820b7c