Malicious PDF — malware analysis report

Static analysis result for SHA-256 b810a376fd45486e…

MALICIOUS

PDF

67.2 KB Created: 2021-02-19 05:31:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 000de50af0b0110b23d974e67b232734 SHA-1: a36d925a0757449f247d4b834ffd42b6399945cc SHA-256: b810a376fd45486e652a0568f02037ad8dc65f0f82ef45256046a85a94adea68
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to known malicious redirector infrastructure or disposable hosting. The heuristic firings indicate this PDF is designed as a link farm, likely to distribute phishing content or malware. The ClamAV detection and ML classifier further support its malicious nature.

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
  • 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 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.
  • 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://crophysi.ru/123?utm_term=sony+kdl40r510c+remote In PDF document text
    • https://cdn.sqhk.co/seseniluvus/QzjhjcW/houston_police_officer_killed_yesterday.pdfIn PDF document text
    • https://cdn.sqhk.co/bimeniwog/jPkidpd/25497582485.pdfIn PDF document text
    • https://buxijabis.weebly.com/uploads/1/3/5/3/135329720/fadatadixasalabivu.pdfIn PDF document text
    • https://motoburibekisi.weebly.com/uploads/1/3/4/6/134623685/zekiko-zugitaru-degipadubame-xotelafifaz.pdfIn PDF document text
    • https://cdn.sqhk.co/rimudatige/hbjbiiE/carnival_fair_fun_adventures_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/jTYihY6/64533433491.pdfIn PDF document text
    • https://topigofifudonif.weebly.com/uploads/1/3/5/3/135304546/1661372.pdfIn PDF document text
    • https://nogenovone.weebly.com/uploads/1/3/4/7/134745979/wujapuk_daxarabina_tezajogolaziw_xenanawe.pdfIn PDF document text
    • https://mefirotevi.weebly.com/uploads/1/3/5/3/135314773/9015221.pdfIn PDF document text
    • https://tadirexexex.weebly.com/uploads/1/3/2/6/132695418/9844617.pdfIn PDF document text
    • https://cdn.sqhk.co/rubekafux/icIxFjh/word_dictation_not_working_mac.pdfIn PDF document text
    • https://fabomitax.weebly.com/uploads/1/3/4/8/134888897/morugu_nusevaleseta_lajibelobipug_vemulogesenu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC967 5372 bytes
SHA-256: 0273e28202c973df5482a89409944ef9004a0281eb8a9c9c0e69683c924e22a8
font_01_sfnt_off0000dbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 10636 bytes
SHA-256: f03638096dd4ad1912fb9954c90de4c7d37498ed19753b6fd1bf4288569593e6

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