Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3724850781cebfa…

MALICIOUS

PDF

85.1 KB Created: 2021-01-15 00:51:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0e5ed41edf66170c8ac4d20510da63a5 SHA-1: 34dee147515838f81d4c9a0c794bcc32d2087eef SHA-256: e3724850781cebfa6e5e8b95dfa5881d6e2ff731b7dc8d0c64f9455858a31c53
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of links suggests an attempt to lure the user to external sites, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffmen.ru/wb?keyword=jp%20schoolgirl%20supervisor%20multiplayer%20mod In PDF document text
    • https://cdn.sqhk.co/vabadoma/7ChanYU/22967296241.pdfIn PDF document text
    • https://site-1166749.mozfiles.com/files/1166749/equalizer_audio_pc_windows_10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465147/normal_5fe1652e99090.pdfIn PDF document text
    • https://site-1174433.mozfiles.com/files/1174433/56063913461.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460723/normal_5ffdfeff8de29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409627/normal_5f959c1d03f39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369331/normal_5fde56d2b70b7.pdfIn PDF document text
    • https://site-1206062.mozfiles.com/files/1206062/70434219882.pdfIn PDF document text
    • https://site-1172843.mozfiles.com/files/1172843/goguardian_parent_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449627/normal_5fd26fc263f12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470979/normal_5fb9977f1fb3e.pdfIn PDF document text
    • https://site-1225854.mozfiles.com/files/1225854/vemovizafixumurutepumoj.pdfIn PDF document text
    • https://site-1179889.mozfiles.com/files/1179889/pikukulenitonokadarazuliz.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/tezofuretejom/pepelowibunebaz.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 5640 bytes
SHA-256: 123697f1adc3976b4a5658934f779a9057bb446e5c73c89aa2a2d5ccab011ba6
font_01_sfnt_off000100da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DA 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00010967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 11744 bytes
SHA-256: 19bbe598cd760f18c1a2285490f8ccc27c03319ad0219e802e42388d9eb35d47
font_03_sfnt_off0001300f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300F 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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