Malicious PDF — malware analysis report

Static analysis result for SHA-256 00498380de6a0c48…

MALICIOUS

PDF

85.9 KB Created: 2021-03-04 16:16:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1e32498eb43c146fa58af524c14444ae SHA-1: dd3cea431b1fa39b743a19314bf2834b52d00667 SHA-256: 00498380de6a0c484cbeaaf4dc151815baca10555aaa683dbdf2e7720ec77307
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the presence of numerous external URLs and the heuristic firings for PDF link farms point towards an attack pattern involving redirection to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=aba+model+rule+1.13+comments PDF link annotation
    • http://hempmap.ru/bresser_bird_feeder_camera_manualss1h2.pdfIn PDF document text
    • http://qrettalq.online/deductive_reasoning_worksheet_with_answer_keyzkzoy.pdfIn PDF document text
    • http://shopbest.online/gozutejowafijikujuwae8sek.pdfIn PDF document text
    • http://chebsvet.ru/pizenukebekepbey4v.pdfIn PDF document text
    • http://wigisosidika.22web.org/development_across_the_lifespan_7th_edition_feldman_download.pdfIn PDF document text
    • http://se-mrush.com/51409433557nzcrz.pdfIn PDF document text
    • http://tibetterrier.ru/glencoe_mcgraw_hill_algebra_1_answer_key_chapter_3vlz7v.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/c8yhj9P/puxin.pdfIn PDF document text
    • http://beliyden.xyz/wufalesuvevujidid10wvz.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/hga0xHO/makixeloxikuxujibitis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_1b579579a6284e569dc1667d6bc12f40.pdf?index=trueIn PDF document text
    • http://bakutogigu.rf.gd/riwugexo.pdfIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_a71ad7221e0e4a8e8a5a9a397e382bec.pdf?index=trueIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_b2636b1b27e54789b6185550fdff4973.pdf?index=trueIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_eb4f2e84d51a48d6aa49d8005d49684d.pdf?index=trueIn PDF document text
    • http://mowilutom.epizy.com/apa_format_reference_generator.pdfIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_6a09f5e34bd2408181e95a2641f235c0.pdf?index=trueIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_6d6ad631c6924795bc5f0726ed924fad.pdf?index=trueIn PDF document text
    • http://xetulugesoboko.epizy.com/rowififezigokof.pdfIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_aaac522ebbc149d8a9fcc85715060d89.pdf?index=trueIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_41be4bb87c674836be06c2d50c7a5814.pdf?index=trueIn 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_off0001147f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147F 5460 bytes
SHA-256: 6b745724f21d180d71c14f1a36ad310843b35791dce9a63abd23bf020c768abf
font_01_sfnt_off000126fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FE 10292 bytes
SHA-256: fab165b0d940ca5349b681b6666b47d89f3a74326b1e3d53ff6b1dce66d7940c