Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a844b4ccfa8159f…

MALICIOUS

PDF

74.3 KB Created: 2021-03-31 08:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9acc6c5c761b1a2e20268ccca761b3c4 SHA-1: ce3a82a341b9514debffd9fe267ab1464116841e SHA-256: 2a844b4ccfa8159f8e2133f37ed335bacb7b6bebf9a3d0ca914e2502a35bab98
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leading to a phishing site or a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=how+much+does+laundry+service+cost PDF link annotation
    • https://gujijuxe.weebly.com/uploads/1/3/5/3/135326775/9211019.pdfIn PDF document text
    • http://zozavelomidabi.scienceontheweb.net/fundamentals_of_arm_wrestling.pdfIn PDF document text
    • https://wujupeduluruwuv.weebly.com/uploads/1/3/5/3/135316277/c36cbf065b3b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472783/normal_5fdcaca9cf87f.pdfIn PDF document text
    • http://lotibamuzuti.scienceontheweb.net/larousse_gran_diccionario_espaol-ingls_english-spanish.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382430/normal_60046ee570151.pdfIn PDF document text
    • http://topikufovumedar.iblogger.org/zuwolubapogiterixokap.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/nida_audition_monologues.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469834/normal_60418c0343e84.pdfIn PDF document text
    • https://vikilegopufuber.weebly.com/uploads/1/3/4/5/134588451/10fbec8178.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fasokefukolu.epizy.com/88388327256.pdfIn PDF document text
    • http://mowiwanafiv.epizy.com/movatidamezonirikot.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/22779870852.pdfIn PDF document text
    • http://kepirodineloga.epizy.com/vuxopobelapumenem.pdfIn PDF document text
    • http://narazawumeked.epizy.com/cours_affaires_rglementaires_pharmaceutiques.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/strategic_business_plan_template_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/is_the_2010_mustang_gt_a_good_car.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/22867306586.pdfIn PDF document text
    • http://gelutusuxipedib.rf.gd/bangla_tv_apps_for_android_free.pdfIn PDF document text
    • http://titudisejofixu.epizy.com/tuberculosis_history.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_off0000e48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48B 5392 bytes
SHA-256: 592cb55e46399a2a99ee67a7cff14765dcae770c774c09d907cfd03c4360a7ab
font_01_sfnt_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 10904 bytes
SHA-256: c17ed35a078c1d5af8e39a6c50c9a49567564c6aa9942c7b48de7012d8927568

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