Malicious PDF — malware analysis report

Static analysis result for SHA-256 318dbe267584dbdb…

MALICIOUS

PDF

82.1 KB Created: 2021-03-23 14:01:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5ec7cbcdcf223729e49b366156fb710c SHA-1: 273ffa8d150e85ead5282d4cf3a402fced40de41 SHA-256: 318dbe267584dbdbc7b86376146284cffaa70cd3342267b05b66a3b9ba6cd6c2
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it contains a link farm and an SEO redirector, with the primary URL being https://zajinet.ru/wix?keyword=vocabulary+workshop+level+a+unit+13+answers+choosing+the+right+word. Although no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest it is designed to redirect users to potentially harmful websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/wix?keyword=vocabulary+workshop+level+a+unit+13+answers+choosing+the+right+word PDF link annotation
    • https://mixojokujize.weebly.com/uploads/1/3/4/3/134387696/sawabefarometuluf.pdfIn PDF document text
    • https://tiruvodeg.weebly.com/uploads/1/3/4/8/134892329/7aa625b70058.pdfIn PDF document text
    • http://goldotzyv.ru/how_to_download_music_for_free_on_itunes_storeods6v.pdfIn PDF document text
    • http://vovevowumusiki.iblogger.org/43634733421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496586/normal_5fd133d94fe46.pdfIn PDF document text
    • https://zipakodexosif.weebly.com/uploads/1/3/5/3/135344546/63487cefa.pdfIn PDF document text
    • https://lenololiwi.weebly.com/uploads/1/3/4/4/134455370/8180130.pdfIn PDF document text
    • https://witabavuwimob.weebly.com/uploads/1/3/4/3/134339013/8966218.pdfIn PDF document text
    • https://nekuferalota.weebly.com/uploads/1/3/1/4/131406939/494190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376878/normal_6055451db776d.pdfIn PDF document text
    • http://nugitesa.iblogger.org/bethena_piano.pdfIn PDF document text
    • https://tadadali.weebly.com/uploads/1/3/4/0/134095934/fotatefuselabef.pdfIn PDF document text
    • http://strapslap.online/681105234onfrg.pdfIn PDF document text
    • https://risegexof.weebly.com/uploads/1/3/4/6/134661868/fovaripixoz-matutifukupep-woleladakino.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zadotelap.epizy.com/ayatul_kursi_bangla.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/prevent_duplicate_form_submission_javascript.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/cash_flow_direct_and_indirect_method_format.pdfIn PDF document text
    • http://tufebogepamik.rf.gd/kibafudipukav.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/karogimadiroduselinut.pdfIn PDF document text
    • http://fonivez.epizy.com/65092876709.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/rirelunamele.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/xelekolefovox.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_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 5976 bytes
SHA-256: 057652a542f8227eabfe16c89a2d1c3453bbf0813bfcbc82aa13a00d0a1a7db3
font_01_sfnt_off000114f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F9 10924 bytes
SHA-256: 6f3cbc9c4b1ed51a862896adab9b6fe241b1d534fb696bac609d61a786956c1d