Malicious PDF — malware analysis report

Static analysis result for SHA-256 489421e55dbf182a…

MALICIOUS

PDF

78.8 KB Created: 2021-03-07 02:12:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3322155bff605145f8105a57c13c1880 SHA-1: 7ed8d01a8b458ff12be0be0db1f083f875924593 SHA-256: 489421e55dbf182a597b8ca5e9183e0e5a37cfad3e0210d8fca423defe2473ae
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs pointing to various domains, suggesting it's designed to redirect users to potentially harmful websites. The presence of a large number of external links, some on disposable hosting, further supports this assessment.

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://nipisod.ru/strik?utm_term=libros+ap%25C3%25B3crifos+enoc+pdf PDF link annotation
    • https://nirumoxizexajiv.weebly.com/uploads/1/3/4/5/134524745/3642629.pdfIn PDF document text
    • https://wifevotus.weebly.com/uploads/1/3/4/8/134897576/kefuz_titifafelas_lilutepajopider.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/podowukan-fulupemi-gerufutakapuxaz-nupigomiburo.pdfIn PDF document text
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/3793556.pdfIn PDF document text
    • https://kedefakoriwo.weebly.com/uploads/1/3/1/1/131164231/mokororuxavuzogojo.pdfIn PDF document text
    • https://lanulizuxuja.weebly.com/uploads/1/3/4/6/134658029/jitanuk.pdfIn PDF document text
    • https://posofipijetudu.weebly.com/uploads/1/3/1/3/131380531/6c13c66e.pdfIn PDF document text
    • https://jadomuvifaxa.weebly.com/uploads/1/3/5/9/135960305/0bae8.pdfIn PDF document text
    • https://vekoduxiboba.weebly.com/uploads/1/3/1/3/131398498/2738609.pdfIn PDF document text
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/9135532.pdfIn PDF document text
    • https://jabasamivesapev.weebly.com/uploads/1/3/4/0/134041177/forosibixadina_gorujujadobasi_fupej.pdfIn PDF document text
    • https://dopupuwupexiro.weebly.com/uploads/1/3/0/8/130813117/4552566.pdfIn PDF document text
    • https://pemilelolobuwi.weebly.com/uploads/1/3/4/8/134881311/df83486debf6fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_458443c83d074911bcfd94a44e410625.pdf?index=trueIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_2eca7ab189874668934532f1a43f7ed9.pdf?index=trueIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_1d3bcaa3ff794e73a5022a923f557755.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54f97910-7c0f-4668-aaae-4ce5c7d5db3e/dopupepi.pdfIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_fefb87e71f9743db85bd44896050c78e.pdf?index=trueIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_4389127703eb41febae1969be8392174.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8345ffb7-214d-47f0-9fb0-82d133d432fb/motorola_cp200_programming_software_free.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_off0000f3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BE 5332 bytes
SHA-256: 5201f7c3883cd84ce19417e55e03c50f540cc89b7543e007e810aee40917ae0c
font_01_sfnt_off000105ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 11812 bytes
SHA-256: abf3061bfee6f5b20b80fe74040200fdf6423208e65a74bc986ccf7ad04dfe1c