Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9d3a58507148ca…

MALICIOUS

PDF

87.0 KB Created: 2021-02-12 06:36:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dfcb96e297dd72a65d08b26ce810eeaa SHA-1: 999a45914ace97b6c216bdca6e260f3127875f4d SHA-256: aa9d3a58507148ca7c107252c7586449609b09272b3f3e7d8a11da70adf94607
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with a high score, and ClamAV detected it as a phishing trojan. The document body, though heavily obfuscated, contains text related to a 'paint and coating testing manual', likely a lure to encourage clicks on the malicious links.

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 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://crophysi.ru/123?utm_term=paint+and+coating+testing+manual+15th+edition+download In PDF document text
    • https://static.s123-cdn-static.com/uploads/4459164/normal_5fc68a5f93d36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376629/normal_60148919c9496.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529095/normal_6005149e1b8db.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/iahdjgH/rovotojudumebavegowasuri.pdfIn PDF document text
    • http://drive4mclaneaustell.com/list_of_positive_affirmations_printableaklqf.pdfIn PDF document text
    • http://youla-24.cc/cancellous_formation_definitiona4w8x.pdfIn PDF document text
    • http://everydayy.fun/36759749703mdgmo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450240/normal_5fe8d3c21b7f4.pdfIn PDF document text
    • https://cdn.sqhk.co/mojafefegamo/UTjjS2H/is_there_an_asana_desktop_app_for_mac.pdfIn PDF document text
    • http://hq-cleartv.info/business_plan_competition_formatkq8y9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469143/normal_5fc5bd3f81d36.pdfIn PDF document text
    • http://pribor-poverka.site/goguvkru43.pdfIn PDF document text
    • https://momobalujinas.weebly.com/uploads/1/3/2/3/132303205/dilipinik.pdfIn PDF document text
    • https://bezixaror.weebly.com/uploads/1/3/0/7/130739980/8351726.pdfIn PDF document text
    • http://floradoma.net/period_tracker_deluxe_apk_free_downloadmacxw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00011517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11517 5524 bytes
SHA-256: a47fd004070ba3700e8b2f3a619ed3344d8279f015ff138eef942b19151184b9
font_01_sfnt_off000127d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D7 11400 bytes
SHA-256: 7720f7b60bf0a2020dfad441cc17602f1059ac7234487a551f319e6e7292026a

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