Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda3b305fac78249…

MALICIOUS

PDF

71.7 KB Created: 2021-02-11 00:12:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ee2c97f1d2fde4f1984f9e6fd6af9cb0 SHA-1: c2726ccc6a09fdfc8d0734cdea83f1f1f5957167 SHA-256: fda3b305fac78249ccc1fc495f809d48e0c8ddfcf8797eb002afb40612d603d9
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF contains embedded JavaScript and links to known malicious redirector infrastructure, indicating an attempt to deliver a malicious payload or phish for credentials. The heuristic firings strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://yafferge.ru/123?utm_term=refrigerator+parts+tucson In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450259/normal_60244c43d640a.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuzemabad/ahekvSG/table_tennis_rules_and_regulations_in_the_philippines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426813/normal_5fe83cab72c65.pdfIn PDF document text
    • http://trelon.fun/hadestown_tony_awards_2019_performancedjmp1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368487/normal_5ffa6a165e557.pdfIn PDF document text
    • http://reawolt.online/e_aadhar_applicationex1jv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493209/normal_600bbcf25b54e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390999/normal_5feb5ed934c9f.pdfIn PDF document text
    • http://procripton.com/boost_your_vocabulary_1_free_downloadlevvv.pdfIn PDF document text
    • http://bestgirl69.com/auto_background_changer_apk_downloadxt3e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384831/normal_600d1daad4991.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/gQVj6QF/loopback_alternatives_for_windows_10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384316/normal_600e32c573aca.pdfIn PDF document text
    • http://auto-fishing-rods1.club/lexus_ls400_workshop_manual_download8vbna.pdfIn PDF document text
    • http://sks-expertiza.ru/vofabukuzobebavodivokogivxkc7t.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_off0000da2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2D 5156 bytes
SHA-256: 02042545c29cde290a2c21581f14b536251b281308c487ea0d8a7cb5a02d94ef
font_01_sfnt_off0000ebd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD5 11696 bytes
SHA-256: 8e667811a8425778443a7666421781c5ea5b3d7f3659d1a7633fa2ad8bafa094

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