Malicious PDF — malware analysis report

Static analysis result for SHA-256 6523e8d3a1dde289…

MALICIOUS

PDF

82.8 KB Created: 2021-02-13 05:55:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0b68e63ce7abaa121135f74314ed9fa3 SHA-1: 4459cbacdc9cd851101b9c47df804b6c4d45047c SHA-256: 6523e8d3a1dde289f3080ba1d2c4912fcd5abd2cc9e520e8076c624f5f562fbb
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URLs, with a critical heuristic firing for a mass external PDF link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://jottigo.ru/wb?keyword=attributes%20of%20global%20city%20pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4527237/normal_5fdbe3dc61ee2.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/NHrjc3f/96173891246.pdfIn PDF document text
    • https://sozizupisez.weebly.com/uploads/1/3/1/8/131872239/9a087914531.pdfIn PDF document text
    • https://cdn.sqhk.co/tolebilu/jhjgwjh/39254720989.pdfIn PDF document text
    • https://cdn.sqhk.co/satasevubu/hbZ0hie/strategic_human_resource_management_an_international_perspective.pdfIn PDF document text
    • https://tekeginisexufu.weebly.com/uploads/1/3/1/3/131381150/2295408.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/azihhgk/zarchiver_mod_apk_terbaru.pdfIn PDF document text
    • https://temetufel.weebly.com/uploads/1/3/1/8/131856903/617271.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447095/normal_5ffadeb992c94.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/ea0UctC/82848303999.pdfIn PDF document text
    • https://cdn.sqhk.co/dudilirugido/jiqGoFu/bus_simulator_indonesia_unlimited_money_apk_free_download.pdfIn PDF document text
    • https://dusonibegoxat.weebly.com/uploads/1/3/1/3/131380688/xosoxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503617/normal_6002216cec854.pdfIn PDF document text
    • https://bojufare.weebly.com/uploads/1/3/1/0/131070992/gekuli.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/tikofaketonub/58503993690.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/formation_barmaid_montreal.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_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 5328 bytes
SHA-256: 5bb917d3f8a63a4aa6b2253c02326125ba16ca12983a35649f13ae8e3377c39e
font_01_sfnt_off0001077e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077E 12376 bytes
SHA-256: 5cfb25d3115dc667ffdaef5671f634115a625443172a3d567ff83b06c92e140f
font_02_sfnt_off00013070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13070 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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