Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4d55168c705b60…

MALICIOUS

PDF

85.7 KB Created: 2021-06-06 13:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 559ba3a794e6bcf0753d79bfeadba31c SHA-1: 3bad273e8703b2e07faf44bcc7fd917697dee0b0 SHA-256: ed4d55168c705b60a468bbef3afde3c51765693c320c5069af6fe3a54a630653
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute phishing content. The primary IOCs are the numerous URLs embedded within the document.

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://crysiq.ru/pbw?utm_term=pisiform+bone+wrist+swollen PDF link annotation
    • https://fidejilajusaxe.weebly.com/uploads/1/3/4/3/134363993/7184766.pdfIn PDF document text
    • https://zotekuruwufuk.weebly.com/uploads/1/3/4/1/134108654/0884d8b2b.pdfIn PDF document text
    • https://befadileniralan.weebly.com/uploads/1/3/6/0/136082268/9013898.pdfIn PDF document text
    • https://binufigelivu.weebly.com/uploads/1/3/4/7/134775083/zefon_vuvejem_nulad.pdfIn PDF document text
    • https://wowobomufib.weebly.com/uploads/1/3/0/8/130874304/1669578.pdfIn PDF document text
    • https://gozulisob.weebly.com/uploads/1/3/4/0/134012313/tobipe_zesepeliw_purupanakemuwew.pdfIn PDF document text
    • https://kajumosezu.weebly.com/uploads/1/3/4/7/134749214/womamumakigesatok.pdfIn PDF document text
    • https://wasatetokis.weebly.com/uploads/1/3/4/5/134513062/lanefifajero-lapovuxenisedij.pdfIn PDF document text
    • https://tijirurilulade.weebly.com/uploads/1/3/4/3/134312421/binis.pdfIn PDF document text
    • https://tekadepaja.weebly.com/uploads/1/3/4/3/134341299/5024832.pdfIn PDF document text
    • https://nuvomananakoleg.weebly.com/uploads/1/3/1/4/131453817/3890222.pdfIn PDF document text
    • https://jedunifoxawixe.weebly.com/uploads/1/3/4/4/134458330/9441609.pdfIn PDF document text
    • https://pilewamef.weebly.com/uploads/1/3/4/8/134849526/dewutoripopokiwotafi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144442119/kirus.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/f/jekarodegu.pdfIn PDF document text
    • http://zufogopojut.pbworks.com/w/file/fetch/144491292/gufexes.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/w/file/fetch/144499245/53013230479.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/f/bamuwujupiludeba.pdfIn PDF document text
    • http://rasovuxosew.pbworks.com/w/file/fetch/144458061/kubaxekitodevexodago.pdfIn PDF document text
    • http://xawaren.pbworks.com/w/file/fetch/144420279/medical_fitness_certificate_for_job_word_format.pdfIn PDF document text
    • http://rixepal.pbworks.com/f/escrever_carta_ao_pai_natal_online.pdfIn PDF document text
    • http://bepisoxu.pbworks.com/w/file/fetch/144435729/rojapumejebikifob.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_off000113f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F9 4936 bytes
SHA-256: 38a20c872bd9c62520439a9b3e96476d336cb37cdd461b8f5ff1c112fab017fe
font_01_sfnt_off000124c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C0 10800 bytes
SHA-256: 73ab7e0159d28925ea4b4f58ba04a3e58bec1b19a3c948a38f53910118307812

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