Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d87a762fc0ebb2b…

MALICIOUS

PDF

69.3 KB Created: 2020-12-22 20:24:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 80e52f31de2e7fd9af10f9d4b2c7548d SHA-1: d15011684e2dab8ffe21d78258a00c81472150b5 SHA-256: 3d87a762fc0ebb2bcdc1fc24552e8bc90c3e739c14ca2f5e72d28fc7b7c15bdb
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with a critical heuristic firing indicating it redirects to known malicious infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'Springboard algebra 1 activity 2 answers', likely to entice users to click the malicious link. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=springboard+algebra+1+activity+2+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405443/normal_5fa8e9f640dc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_5fd1b7485d1e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407327/normal_5fabb3cce2095.pdfIn PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/0fc856f05f8aaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381973/normal_5fa230b9b6210.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f8301ce-13c4-457f-8105-73a5a26f9a8b/xemile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c49b1966-1ad2-4e00-9fa0-ef31dcf151e9/13444650046.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/546949134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d0f62e3-ed26-4113-bb72-60a695bcbc14/do_planeswalker_have_summoning_sickness.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/52673807694.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_off0000d10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10A 5924 bytes
SHA-256: 70bf05048a6e3b2c09a6c292c9f3cc81f098bdeba8c6a2620cf0feda4fdb84b6
font_01_sfnt_off0000e558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 10436 bytes
SHA-256: 4591f3b65a0994963fdb778e6068e06defe70da4a8b90e83d5899885021e1507

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