Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e64114e74b3aa4…

MALICIOUS

PDF

70.6 KB Created: 2020-12-23 17:33:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 90885ccfd3e69d19b3140ecb650caeef SHA-1: 7af652996108baf8e6e74f1f5bbafa01baeda0b8 SHA-256: d8e64114e74b3aa4d53485bcb47debcd59f7e6296ff76d05d8f485070218796b
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of multiple links suggests an attempt to direct users to potentially harmful external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/123?utm_term=navy+manning+levels+by+rate+2018 In PDF document text
    • https://cdn.sqhk.co/mozejipakas/vIfiegc/music_car_crossy_road.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426957/normal_5f9a3b550893d.pdfIn PDF document text
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/5192834.pdfIn PDF document text
    • https://cdn.sqhk.co/lutaxudepoje/FXHheMk/sibex.pdfIn PDF document text
    • https://penulikadima.weebly.com/uploads/1/3/1/4/131482887/jadifipozekiw.pdfIn PDF document text
    • https://bazubipevudupu.weebly.com/uploads/1/3/4/8/134876407/detorasu.pdfIn PDF document text
    • https://mixirarorasuju.weebly.com/uploads/1/3/4/3/134317495/daves_xajivejitoxare_fefula_jobanadazotuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409425/normal_5f92c22981ab4.pdfIn PDF document text
    • https://jezosodakadofa.weebly.com/uploads/1/3/4/3/134376186/bisipivakikiloz-tarube.pdfIn PDF document text
    • https://vefavufarexuba.weebly.com/uploads/1/3/4/3/134315694/99ab684488419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500429/normal_5fd787659c906.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475219/normal_5fcca2c771000.pdfIn PDF document text
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/zalamibuxu_lejolex_jewov_fajak.pdfIn PDF document text
    • https://cdn.sqhk.co/bitubebo/ifhgavR/dolarewutijafefiv.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/pasawexawinogad/android_draw_rectangle_outline.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/27527158223.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82F 5796 bytes
SHA-256: 5520e8eb592d93d675d1d68d3170b2025b008332694245c4cd2ef1a4f3931617
font_01_sfnt_off0000ebe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 9928 bytes
SHA-256: d6ecc086f21e7cc0c4712b6cccb6636a8d7d9b8eebeeb2d95ee43f7e39d062a0

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