Malicious PDF — malware analysis report

Static analysis result for SHA-256 43357b0f090d2e5f…

MALICIOUS

PDF

76.0 KB Created: 2021-03-24 23:02:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d00be682ccae8713e2aed9905eea7a25 SHA-1: 2296ef61e34e365efd314f02e3193d412b014bc5 SHA-256: 43357b0f090d2e5ff0341d6e1b01f3e9a9f464b05a21ad04c558e17128cacaaa
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 attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=what+does+god%2527s+justice+look+like PDF link annotation
    • https://xasigevas.weebly.com/uploads/1/3/4/5/134595911/9379474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_600e0293b365d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477379/normal_6019c7eaf1df3.pdfIn PDF document text
    • https://dopikilazobowu.weebly.com/uploads/1/3/4/4/134488506/zutixemijil.pdfIn PDF document text
    • https://xuwudivalef.weebly.com/uploads/1/3/4/8/134889087/7070316.pdfIn PDF document text
    • https://sibuzowad.weebly.com/uploads/1/3/2/8/132814892/rebutogilobita_silutesaje_fabotow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490515/normal_6051905abcc5e.pdfIn PDF document text
    • https://ziwagunu.weebly.com/uploads/1/3/4/8/134883986/bulejar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cc59cde-2572-4ed7-9250-1a335554bc8d/honeywell_th8320u1008_factory_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e96a72ff-bd7f-49e3-9849-71bad2bab9cd/24145861705.pdfIn PDF document text
    • http://xepatodop.onlinewebshop.net/candidate_experience_survey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a552525-376a-4636-97cc-6c1f20d50eba/miwutokamenitix.pdfIn PDF document text
    • http://potufepevumu.rf.gd/34608002858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe7a3a9a-6fdc-48d4-8940-76bc8a6be1ca/veleburonosupaloxo.pdfIn PDF document text
    • http://zunuwovadete.epizy.com/36975737554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a019b9-eb95-48ae-af50-7aa357b8f93c/74683938724.pdfIn PDF document text
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_f508ea5f466541e683e4a6fa4c90edfb.pdf?index=trueIn PDF document text
    • http://dasabenanej.epizy.com/final_fantasy_tactics_strategy_guide.pdfIn PDF document text
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_684e364fd9ab4eaaaf760d22bb2ac149.pdf?index=trueIn PDF document text
    • http://tajavuminona.atwebpages.com/jesapigakogokufuzunig.pdfIn PDF document text
    • https://e8e87dc5-637d-47ba-9de6-e7d98d123d78.filesusr.com/ugd/a69a03_53702b6285b74d03b3476875695245ff.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_off0000ecba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 5292 bytes
SHA-256: 1364c2da8a8ee6cb76ad8417bfafa3686290aed5ef9df84346ba8b903f0605c0
font_01_sfnt_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 10476 bytes
SHA-256: c8e06ffa3234305864fc74b004372517ae304a433b5f9b452bad397d6ace724c