Malicious PDF — malware analysis report

Static analysis result for SHA-256 e383087e6e18aa47…

MALICIOUS

PDF

66.5 KB Created: 2021-03-16 16:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2e84c22f8045f1443c6941b43f93f997 SHA-1: 9abc82922cea5f34e90585bb57665af684850b16 SHA-256: e383087e6e18aa477d9c31b7fdf3abcf7b76d262b5ef22d9ca1ee710a960418e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the PDF as malicious, specifically a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/123?utm_term=lagu+akra+lai+lai+remix+planetlagu PDF link annotation
    • http://gejudoxe.mypressonline.com/somewhere_over_the_rainbow_chords_eva_cassidy.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/tinefiniratupanumanomelew.pdfIn PDF document text
    • http://jushq.club/hp_z440_release_datezst4j.pdfIn PDF document text
    • http://xibiselid.medianewsonline.com/estudio_descriptivo_correlacional.pdfIn PDF document text
    • http://xijipeva.mypressonline.com/edital_prf_2020_funcab.pdfIn PDF document text
    • http://usmileofficial.site/bejumo7b23n.pdfIn PDF document text
    • https://ludilejufa.weebly.com/uploads/1/3/5/3/135347725/vanuz.pdfIn PDF document text
    • http://interstart.online/excel_formulas_list4m0c9.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/who_were_the_first_christian_martyrs.pdfIn PDF document text
    • https://luligokim.weebly.com/uploads/1/3/4/7/134715748/b70773fa.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/4849716388.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_b3695b33b6df465bb83e6d51a1e2548a.pdf?index=trueIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_23964fc9a0414c5f876db19dcbb4ec4a.pdf?index=trueIn PDF document text
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_fba480d5e8dc453aa322938ad32ac138.pdf?index=trueIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_4656edeaa91d4defb7359b4521ae4d57.pdf?index=trueIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_b14e0af23a564f21a9621d295797b47d.pdf?index=trueIn PDF document text
    • http://kuxemozoxabonag.onlinewebshop.net/norinetek.pdfIn PDF document text
    • https://e44de090-c64a-4a0f-b555-2784aa0ac37b.filesusr.com/ugd/41d583_01786c3ae1154690b9b14882e0877d5d.pdf?index=trueIn PDF document text
    • https://a4067306-84c0-45ce-9c36-3cbb795fcb37.filesusr.com/ugd/d5b970_e0835bbd554a4ffb9292a0623a29ad65.pdf?index=trueIn PDF document text
    • http://wugujub.onlinewebshop.net/kapanutib.pdfIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_9bb7bac89df744ddbb34af1522695ecf.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_off0000c98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98B 5036 bytes
SHA-256: 6dea1bccad56b564551fe8c8a6ef2d2df301dae57aa97ce4c0c0da6561b6968b
font_01_sfnt_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 9912 bytes
SHA-256: abe2cdfda01fd65469e163d340c727a529019f07872f94153cd039592e6820f3