Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3327e23ca13283…

MALICIOUS

PDF

80.9 KB Created: 2021-02-15 01:28:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 312bd01dbffb9661dfcbc48a173719f8 SHA-1: c160f6d7172b4b246842b2d5c49438e3a4d01f1f SHA-256: 8d3327e23ca132836e76f65d03b8aa53e3c8214d3392742c942473bdbf25f393
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with critical heuristics indicating that it links to known malicious redirector infrastructure. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains text that appears to be related to download lures, further supporting a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=emuparadise+ashes+cricket+2009+apk In PDF document text
    • https://cdn.sqhk.co/filomada/ihejdhd/broken_dawn_2_mod_apk_android-_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420599/normal_5fe99dd18c9a4.pdfIn PDF document text
    • https://cdn.sqhk.co/potasuregoz/dhju7hb/duzuwigobizitatajoja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370089/normal_6013c54e5ac8c.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/iggcnt0/39320503158.pdfIn PDF document text
    • https://cdn.sqhk.co/wubukuxivupe/zjgdLaV/3818033937.pdfIn PDF document text
    • http://slmit.space/69896239033ph1n0.pdfIn PDF document text
    • https://cdn.sqhk.co/berirenike/hgheJAp/vofojizeguwiwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448542/normal_5fe9e0e5d30bd.pdfIn PDF document text
    • http://mnogoturov.com/81054255630hqgl7.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/xhhVii7/68041689808.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/hcigGgx/new_cheat_for_among_us_pc.pdfIn PDF document text
    • http://copyrighthelpbusiness.net/appetite_pro_rounded_free_downloadnczjx.pdfIn PDF document text
    • https://cdn.sqhk.co/bolukawet/Gjbgdjb/87324351101.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403406/normal_5ff5597a5759e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_6016030a7cbd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380090/normal_5ff68a370f9b4.pdfIn PDF document text
    • http://secret-empire.ru/10899421951lo0ew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387702/normal_5fe1d175a8cf0.pdfIn 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/bidivo/97894469718.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/android_sdk_unity_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/internship_report_on_bituminous_road_construction.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/acronis_drive_monitor_filehippo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 5396 bytes
SHA-256: f2fdb49dda5f2dbed13e5e9cdd35a28ec62fadb418a386b79466e65f0825072a
font_01_sfnt_off000102ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102ED 10808 bytes
SHA-256: 017b10a573c70b14b705d55c97f633788b36202af95944db6a8c9d05a8e92580
font_02_sfnt_off000127c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C1 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361