Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef5f9074ac11093…

MALICIOUS

PDF

78.2 KB Created: 2021-02-12 09:26:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5c6f67b34d199dde995745d8e15ea4e7 SHA-1: 56a541781d007d028a4704caabe39e1445522792 SHA-256: 3ef5f9074ac11093e55a56e78266c5f2b8883f533a824886ae46127b6f1191f1
126 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, with one prominent URI pointing to 'maypoin.ru', suggesting a phishing or malware distribution attempt. The presence of external URIs and the overall detection profile strongly indicate a malicious intent to redirect users to potentially harmful sites.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://maypoin.ru/123?utm_term=bali+hai+song+better+call+saul PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454822/normal_5ff279c557ffd.pdfIn PDF document text
    • http://malespw.xyz/viral_video_today_tiktok_star_nisha1vzuy.pdfIn PDF document text
    • http://andyhong.blog/kunedotifastyrt9.pdfIn PDF document text
    • http://chuvashovfamily.ru/nufufotazapowa05ui8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447641/normal_5fe8ec67cfc68.pdfIn PDF document text
    • http://goshop32.site/blastoid_transformation_definition2lw6x.pdfIn PDF document text
    • http://org-fruit.space/giponaboy0k99.pdfIn PDF document text
    • http://alcozerox.com/507814809103uk8h.pdfIn PDF document text
    • https://vojidejera.weebly.com/uploads/1/3/2/6/132695434/9355da.pdfIn PDF document text
    • https://tolixolosunep.weebly.com/uploads/1/3/4/4/134403343/tubeto.pdfIn PDF document text
    • https://pefisidedufe.weebly.com/uploads/1/3/4/9/134902532/5690383.pdfIn PDF document text
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/jirafoloxiko-zadusor-jamomujokidobon.pdfIn PDF document text
    • https://bumarotijij.weebly.com/uploads/1/3/4/6/134688095/suvitilul-zevemirenop.pdfIn PDF document text
    • http://naturaitalia.space/44114598016fo5ix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423189/normal_5fff96a185b1c.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/tojazudibumogab/printable_wedding_planner_guide_checklist.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/uc_browser_video_problem.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_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 5252 bytes
SHA-256: 1c0e0e0948b822c027c4a4b03149d70578b3a3e3d679a4cda4543a51a97f0edb
font_01_sfnt_off00010324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 11476 bytes
SHA-256: 96f5bbce4fda9beb39404ebdda56eb020dfdb11fa93435208fcb18a5825f69b5

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