Malicious PDF — malware analysis report

Static analysis result for SHA-256 8544c77055ee654c…

MALICIOUS

PDF

62.7 KB Created: 2020-12-17 08:28:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9d0185c4ed32a71733fae73fb4dca170 SHA-1: 14f9d22e7686edee003d298bf34fb24ba1566d6d SHA-256: 8544c77055ee654c86e774d52d542e0da4b691933be94b832b3d585eed9f8429
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The heuristic firings indicate this PDF is part of a link farm designed to direct users to malicious infrastructure. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection suggest a phishing or malware distribution attempt.

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
  • 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.
  • 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://traffmen.ru/123?utm_term=points+lines+and+planes+worksheet+1-2 In PDF document text
    • https://gozikiri.weebly.com/uploads/1/3/4/4/134493270/4143536.pdfIn PDF document text
    • https://figeneluniw.weebly.com/uploads/1/3/4/8/134857588/6580755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475571/normal_5fc2fedfa02e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410722/normal_5fc40be9abdf7.pdfIn PDF document text
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/mevupulobab.pdfIn PDF document text
    • https://gazofifato.weebly.com/uploads/1/3/4/4/134496451/fujam-jinivefu-jalebozomasuk.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/senodiw/xonukaxosik.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fceea1d4809fd7eb9df6a8e/t/5fd0fd07d92236716006e01a/1607531784651/mekivupekobafoz.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51c9aa87939686423652d/t/5fd6515172b1137fa97374d9/1607881041913/formation_barman_sur_paris.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc78412c39fde0238aa55d7/t/5fd00f7b470abf4ba8fb3a41/1607470972131/96988723137.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6448340f1034a5ccd57f3/t/5fcb5286393ce473563182ec/1607160455230/michigan_archery_tournaments_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce1322e5a13e2fea6ddff5/t/5fcfef3b747f573790d2662f/1607462715707/86370452425.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_off0000b859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB859 5420 bytes
SHA-256: ef5a26dfaba849cdee58de45b0531a7179233a67b8271308e64915e63c2fbbd9
font_01_sfnt_off0000cadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADF 10372 bytes
SHA-256: 8369506594d24edadb5b871543b0b34c70c071fb2fdae589ee5d7c9306157ff8

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