Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1596762d89f9e8d…

MALICIOUS

PDF

78.2 KB Created: 2021-02-21 01:27:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 500e2ad93202e05bac998f5641b5c101 SHA-1: 436213be1cd0669cfc3fe7c1cffa94ebbc13a316 SHA-256: c1596762d89f9e8dd42e0c9c931714ea7ec0dfc5564a18ced927e5b1b1189332
184 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to disposable hosting and redirect to malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'Kali linux tools pdf download', suggesting a phishing or scam lure. The presence of multiple malicious redirector links and a high ML classifier score indicate a high likelihood of malicious intent.

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://yafferge.ru/strik?utm_term=kali+linux+tools+pdf+download In PDF document text
    • https://jodowofimen.weebly.com/uploads/1/3/5/3/135330599/bojovowa-nalikirufogevip-rosup-wozoxewenezejit.pdfIn PDF document text
    • https://cdn.sqhk.co/xewiliwilax/g5Nc1Sa/tiles_hop_app_store.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/ebLibia/zazovumapipawotesun.pdfIn PDF document text
    • http://nemeloru.66ghz.com/vofowot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374715/normal_5fe5e3ddc9ab0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489237/normal_60129554052c9.pdfIn PDF document text
    • http://pijabaralipori.22web.org/zufulowubivigetalijegoje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_5fd6ef6ca2c4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488316/normal_6011b7f482ea1.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/tixeligufokup/android_10_for_note_8.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/88865538314.pdfIn PDF document text
    • http://vugikalijuboxo.epizy.com/nesetatarup.pdfIn PDF document text
    • http://murarefap.epizy.com/runescape_3_temple_of_aminishi_guide.pdfIn PDF document text
    • http://pofegafiwej.epizy.com/4669185269.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_off0000e942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 4832 bytes
SHA-256: bce781410381c7f2ea156e02001dd55171e3adec7925051cda6106b056487bdd
font_01_sfnt_off0000f9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 10496 bytes
SHA-256: f8df00bc0cf96eb7ae1ade51cb20893bfad8c7063230eeb57a8508dd1d138fbf
font_02_sfnt_off00011dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCC 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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