Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44932b27c3559ab…

MALICIOUS

PDF

82.8 KB Created: 2021-04-28 01:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3ac322fb5be9976e38d810c2d4752f69 SHA-1: 210c127bdad0873299048e0c9f3e7fa749a48b51 SHA-256: b44932b27c3559ab318bfc5a01e491316a2b51415eb727a04375364e8f874a16
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 hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious or SEO-abusing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=abu+garcia+black+max+spinning+reel+line+capacity PDF link annotation
    • http://komamoj.22web.org/l_appareil_digestif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495846/normal_6018a2f8939dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403262/normal_601fe84308dba.pdfIn PDF document text
    • https://jakilirimilibev.weebly.com/uploads/1/3/4/8/134862861/f92c38a.pdfIn PDF document text
    • http://tinipen.medianewsonline.com/auxina_tricogena.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/catia_v6_tutorial.pdfIn PDF document text
    • http://kepuxom.mypressonline.com/upsc_mains_sociology_optional_syllabus.pdfIn PDF document text
    • http://xemororiwabu.iblogger.org/etiology_of_peptic_ulcer_disease.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/5717498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412775/normal_603bd3ebd99d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_ee8de4061c2949e3af01466e94b44992.pdf?index=trueIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_882211b733224c82982102778ca0e59f.pdf?index=trueIn PDF document text
    • http://komadolosa.rf.gd/utah_motor_vehicle_bill_of_sale_form.pdfIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_05bcd1e727fc4b35a2f5390bd4314f10.pdf?index=trueIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_93d4f06eb14e4aa39d1da22dc1af7e03.pdf?index=trueIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_f629ed4ec80a4763bb0bc5b7cc593182.pdf?index=trueIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_4aa66e22e22644f1acc8541e749a1d9f.pdf?index=trueIn PDF document text
    • http://gedemuzufo.epizy.com/cbse_biology_class_11_ncert.pdfIn PDF document text
    • https://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_2f557af7237845498c30ad497722e140.pdf?index=trueIn PDF document text
    • http://puzasapexuwuju.epizy.com/40099078035.pdfIn PDF document text
    • http://romapubimowa.onlinewebshop.net/vaughn_bioethics.pdfIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_6e38ff7f1b45490593af4b9f2fa22574.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_off000104c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C4 5616 bytes
SHA-256: 3222b2a48584c6faa0966bc8ce4f2e9ee171cfbc94392c1760c4cf3b8dab164a
font_01_sfnt_off000117ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EA 11084 bytes
SHA-256: 2fa24bcbea25c847abbf84885285d8d81612a9121fafc6afdf5a9676c6d722ac