Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4984615405d856…

MALICIOUS

PDF

96.0 KB Created: 2021-02-14 15:31:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d25d1874253293d313f4e0da6daa938f SHA-1: 5d903628fd6f373b82566e079c2e94b9f4c86a94 SHA-256: 0b4984615405d856756e41bfa6de672a46bbba6d9a03e4e89f22e50e1baa2a3a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern involving directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/123?utm_term=hartree+unit+to+ev PDF link annotation
    • http://urott-hu.com/what_forms_an_acidic_solution_in_watervidxs.pdfIn PDF document text
    • https://cdn.sqhk.co/sepovili/dWjgeje/22811219850.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/PMjgAjg/pop_song_quiz_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417319/normal_5fe01c0bc11fc.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/logitech_laptop_speaker_z205j5tv8.pdfIn PDF document text
    • https://besukobar.weebly.com/uploads/1/3/1/0/131069863/lubotowe.pdfIn PDF document text
    • http://7lessons.website/24967203557hmpld.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480743/normal_5ffcf99ed5772.pdfIn PDF document text
    • http://social-whisper.ru/99860197718xlhup.pdfIn PDF document text
    • https://cdn.sqhk.co/govazilose/eLhdFgi/42378210995.pdfIn PDF document text
    • http://copyrighthelp.info/dezaposazigimuj3rhgy.pdfIn PDF document text
    • http://blacklaser.ru/full_hd_cartoon_wallpapers_for_androidr5r5h.pdfIn PDF document text
    • http://help-igcopyright.xyz/nuxirusalokidilewi9blx.pdfIn PDF document text
    • https://libuxematofep.weebly.com/uploads/1/3/1/0/131070581/defusekotexejuxomok.pdfIn PDF document text
    • http://pedalini.club/brimnes_headboard_instructions02vrp.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vasofirida/nuzuvekebarigotita.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/pozimazixelekerimowu.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://www.gnu.org/licenses/gpl.htmlIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f7de.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF7DE 15812 bytes
SHA-256: be588aae5e071b6b027ad6de3c0245aa3b6384b0beff039d297709451aae2ba1
font_00_sfnt_off0000ddff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 3080 bytes
SHA-256: 3ea9dc0fe5daeba8b7c1286de8752a991578e51b79301a8010be3d8f06b4997c
font_01_sfnt_off0000e907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE907 4372 bytes
SHA-256: b8a9345e2f52c77c90d3716723ac14310eecdc8d354e08903672eaec7e5e68a9
font_03_sfnt_off000123c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C6 12304 bytes
SHA-256: b4706f5accab62984a2e61722c828c1d8729dccdba482fd54166408da9b1daf6
font_04_sfnt_off00014e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0E 16300 bytes
SHA-256: 06189f2f42abbf0fd2b3d9dd16baa349426f6e1389728a4763ea2cb028c6ce22
font_05_sfnt_off000163c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C7 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f