Malicious PDF — malware analysis report

Static analysis result for SHA-256 27227db1d03dc2de…

MALICIOUS

PDF

64.0 KB Created: 2020-12-05 19:46:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 13e14220356bfa8b77e280ed9b1b6961 SHA-1: d3a67bb41050ff880b87741e86c6db98b41c38fa SHA-256: 27227db1d03dc2de7eaff457c39991fbebc824599fedfe4478c8f6811c2b3725
184 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, including a critical alert for linking to known malicious redirector infrastructure. The embedded URL, disguised as an answer key, leads to a site associated with phishing and malware distribution. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?utm_term=protein+synthesis+worksheet+answer+key In PDF document text
    • https://static.s123-cdn-static.com/uploads/4469350/normal_5fca7f928a967.pdfIn PDF document text
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/7777638.pdfIn PDF document text
    • https://wewejodoje.weebly.com/uploads/1/3/4/6/134685686/6104701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407788/normal_5fa8f72f8106c.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/1815170.pdfIn PDF document text
    • https://lujadogube.weebly.com/uploads/1/3/4/5/134522393/469c5ae4626c.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/43a1547e-04d9-4d65-881c-6eda067608ef/jofadine.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc78118a4492a057e23daae/t/5fc94ca34ca67815841cf77c/1607027877123/dawafikinodazejidilafepob.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc657d6bdb33045eee7419e/t/5fca9fb94780a777057d01f0/1607114686848/verabofirofow.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc007006609fd0ee78c7004/t/5fc139a8e6d49a06bbbe97b7/1606498730254/43127877425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6afb8ceb-f064-47d3-b2b3-1de362cc655c/lerebuvovaroxegone.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf66877acac6192ab917e6/1606379143212/casio_w753_manual.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_off0000bef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF0 5000 bytes
SHA-256: c62c8ec5756c9b07eb52628129afbc32c04728ebdb24ee2ffbf29e6505cec1a6
font_01_sfnt_off0000d000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD000 10596 bytes
SHA-256: 582754c2f5c7ad4b7a27f88faf663ec784436766182fe5425d6586d42d8345cf

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