Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d2fe8cc4a37b97…

MALICIOUS

PDF

79.2 KB Created: 2021-03-22 12:10:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b03a087503860eb55a4ef4b335cf032a SHA-1: 7ff5068f99402225d334b497b49f0d1149b13743 SHA-256: e8d2fe8cc4a37b97c205e9bcf3f3632bbe1694c5106635a9a84016f3da53dbf2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to suspicious domains and are likely part of a link farm designed to distribute malware or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. The document's structure and embedded URLs suggest it is used to redirect users to malicious content, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=ib+history+paper+3+study+guide
    • http://future-techno.ru/49570975706gncpd.pdf
    • https://gunosevibo.weebly.com/uploads/1/3/4/7/134716368/padejatemu.pdf
    • http://lefofusi.22web.org/98271883197.pdf
    • https://fuvepuzineg.weebly.com/uploads/1/3/4/4/134463404/c866559f98.pdf
    • https://cdn-cms.f-static.net/uploads/4367296/normal_600b3d38214c7.pdf
    • https://cdn-cms.f-static.net/uploads/4450048/normal_6049e9fba3fdc.pdf
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/dd7d66.pdf
    • http://service-hire.com/74504753243djku3.pdf
    • https://poxomovuru.weebly.com/uploads/1/3/1/3/131381772/2f9f5aa47.pdf
    • http://vofovadero.22web.org/mipoxajejukakiw.pdf
    • https://cdn-cms.f-static.net/uploads/4469135/normal_6052eb178dbc0.pdf
    • https://cdn-cms.f-static.net/uploads/4383918/normal_603e438b53fbd.pdf
    • https://cdn-cms.f-static.net/uploads/4416139/normal_601b1d531bb4c.pdf
    • https://cdn-cms.f-static.net/uploads/4415326/normal_603084fed84f8.pdf
    • http://nazhivy.net/duvet_sheet_en_espaolkc2r8.pdf
    • https://cdn-cms.f-static.net/uploads/4377936/normal_601c73af4fee6.pdf
    • https://static.s123-cdn-static.com/uploads/4494648/normal_5fc5b4bb343e4.pdf
    • https://cdn-cms.f-static.net/uploads/4450890/normal_5fdaabbecbb24.pdf
    • https://cdn-cms.f-static.net/uploads/4370062/normal_604e7df3a5292.pdf
    • http://vekenuv.iblogger.org/6627052676.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b3b48655-2287-4daf-9f14-7316e2dfcf54/nubigirezuxaxafusosi.pdf
    • https://uploads.strikinglycdn.com/files/d6dd42c7-7f15-4aa5-a723-f3b33548d4dc/minnesota_motorcycle_safety_center_msf_basic_rider_course.pdf
    • https://uploads.strikinglycdn.com/files/19c22427-549b-4f4a-a8e5-1d08e42d93f2/illuminated_manuscript_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/3416814d-eaac-4ce2-97dd-8202ccd4752c/medar.pdf
    • https://uploads.strikinglycdn.com/files/211c5bd2-def6-4efa-9f4a-dbe381589eb8/miss_peregrines_novels_in_order.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f791.bin
83a9348a10e40de04582c8a88833d76695879b386be1cec82a3c9cc449a03fd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 5532 bytes
font_01_sfnt_off00010a55.bin
190034a2d042633dec6c8c06269470374ea3eb64a0c7351cc133626b49bc88af
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A55 10928 bytes