Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f77c40b5514efa…

MALICIOUS

PDF

67.8 KB Created: 2021-02-21 01:59:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 03c3e1ff966ea33c9f55ddc5df56e5e4 SHA-1: caea52ed39def5d71361f16b46d6f2d5ae6fe139 SHA-256: 87f77c40b5514efa347eee2cc75958853d136988a0807782f3df34f875fd3cde
254 Risk Score

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=ib+physics+study+guide+tim+kirk+pdf In PDF document text
    • https://zajevikafe.weebly.com/uploads/1/3/5/2/135297545/55fb1af566912.pdfIn PDF document text
    • http://particulieres-societegenerale.best/dapegit4at6.pdfIn PDF document text
    • http://the-job.ru/bareboat_charter_agreementthv8b.pdfIn PDF document text
    • http://stassikorskyi.com/xelujifajovupb3boq.pdfIn PDF document text
    • https://vavulawukuret.weebly.com/uploads/1/3/4/6/134690424/4684826.pdfIn PDF document text
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/voxoje.pdfIn PDF document text
    • http://orbitan.fun/96270513702l6hsj.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/84435201311zp6bq.pdfIn PDF document text
    • http://datingsexchat.site/aiken_school_of_performing_artsqha7z.pdfIn PDF document text
    • http://thecabinets.xyz/514834732170u7u6.pdfIn PDF document text
    • http://migerov.xyz/523439096993r5jg.pdfIn PDF document text
    • https://deluwibenarut.weebly.com/uploads/1/3/1/3/131382693/zotudafufi.pdfIn PDF document text
    • http://milanomoda-italy.site/zetufiwupemepururareduwowjjkga.pdfIn PDF document text
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/5794633.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/vebisop/5114380101.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/66979935641.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/full_backup_android_to_sd_card.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/96053075587.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/xusokasigosuvodadul.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/panim.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/22991631700.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/ielts_score_reporting_for_usa.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_off0000ccbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBE 5572 bytes
SHA-256: 0a824d89c5edee1300d1ad22a836d3f14d10b2fe7d6141ba635ab90e4e6ccbbf
font_01_sfnt_off0000df8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8E 10080 bytes
SHA-256: bc212292974ed73edfa412153f1bcdc547c16bf35d14de1ccb7bc8824435d3c5

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