Malicious PDF — malware analysis report

Static analysis result for SHA-256 0382e5356bad43a1…

MALICIOUS

PDF

78.4 KB Created: 2021-04-30 00:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 447bff9247d8786a1ee94e78d2d30fda SHA-1: 5e6a3b6db4d499f79665a1b0fb8b65d370068fe8 SHA-256: 0382e5356bad43a1da48eb989c8720c50313e49868ef2b6cc2f4cf0f612e4bbc
244 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable hosting or known redirectors, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings suggest exploitation of PDF vulnerabilities to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://dafemum.ru/strik?utm_term=what+are+the+dimensions+of+the+2020+lexus+rx+350 In PDF document text
    • https://puzuzabijil.weebly.com/uploads/1/3/2/8/132814257/65b8652c1df.pdfIn PDF document text
    • http://basagutidabe.sportsontheweb.net/nextbook_ares_8a_stuck_on_boot_screen.pdfIn PDF document text
    • http://tegotapiw.scienceontheweb.net/defojo.pdfIn PDF document text
    • https://gerikolobel.weebly.com/uploads/1/3/1/3/131398187/pasomuzinul.pdfIn PDF document text
    • http://itrom.fun/99265585054s1cks.pdfIn PDF document text
    • https://puxokobipo.weebly.com/uploads/1/3/4/5/134524361/af2fed0ea811eb.pdfIn PDF document text
    • http://medway24.com/660342620639dspd.pdfIn PDF document text
    • http://basvuruizleme.online/waboxixumuzmdtcl.pdfIn PDF document text
    • http://sozapemogoz.mygamesonline.org/wozig.pdfIn PDF document text
    • http://pifumufupes.iblogger.org/golewigitekorexiviwuku.pdfIn PDF document text
    • https://nopefoxanav.weebly.com/uploads/1/3/2/6/132696012/532894ee3c.pdfIn PDF document text
    • https://tamipabofoj.weebly.com/uploads/1/3/4/8/134876193/vakuf.pdfIn PDF document text
    • http://takojebuti.iblogger.org/relative_clause_worksheet_defining_non_defining.pdfIn PDF document text
    • http://jetaxopavajuluw.22web.org/bakelite_sheet_manufacturers_in_mumbai.pdfIn PDF document text
    • http://kuzojud.66ghz.com/pretty_little_liars_season_4_episode_24_bg_subs.pdfIn PDF document text
    • http://setofexperience.site/napukowojrophy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_2aa702c44b54460abaef6a675a07c956.pdf?index=trueIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_2072b435978a4c7c91953386e40ccb1a.pdf?index=trueIn PDF document text
    • https://264cdfe8-48fc-440e-bff3-938583425051.filesusr.com/ugd/cd20dc_75356f02054544cbb61893b2a3aa11ee.pdf?index=trueIn PDF document text
    • http://zotubune.myartsonline.com/62143846357.pdfIn PDF document text
    • http://wudemexa.myartsonline.com/67985873446.pdfIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_b234e9d94197454e9c6db2d02100194d.pdf?index=trueIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_d588f686c01e4d66974a3ea45ea31c0c.pdf?index=trueIn 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_off0000f2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BE 5788 bytes
SHA-256: a1e031cd1069a8eb1bea26b0c0a00eecd3dc0ef5722202884dfa1c2fa032dc3e
font_01_sfnt_off0001065d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065D 10988 bytes
SHA-256: 453384fa96862d215b893f61d40ce1279a480295b4f0305c9f2d14bd8541b53d

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