Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5632a08425d638…

MALICIOUS

PDF

75.3 KB Created: 2021-05-22 01:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a6608fafc39b33a97fc28b11e5fe9e7c SHA-1: 0c72b9c1a6099e5836aa55ec4e001636b285eb82 SHA-256: ed5632a08425d638acb71666dbe1aeceb17233e7a0602d197707a7805b79a73e
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 hosted on disposable domains, indicating a link farm designed to redirect users. The presence of 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics, along with a high ML score and ClamAV detection, strongly suggests malicious intent. While no scripts were explicitly extracted, the structure and heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/strik?utm_term=ultimes+paroles+baird+t+spalding+pdf PDF link annotation
    • https://xemiwiwoxotewa.weebly.com/uploads/1/3/5/3/135325065/bopodi.pdfIn PDF document text
    • https://jugafuxuxeg.weebly.com/uploads/1/3/2/7/132740719/nefomi-fizopijuzifin.pdfIn PDF document text
    • https://mijutadozas.weebly.com/uploads/1/3/4/5/134590660/188174.pdfIn PDF document text
    • https://relelije.weebly.com/uploads/1/3/1/4/131438324/a516724f423bd.pdfIn PDF document text
    • https://gikanirirexenad.weebly.com/uploads/1/3/0/7/130776133/saxuxolo.pdfIn PDF document text
    • https://jumuwubugunitus.weebly.com/uploads/1/3/1/0/131070493/fegidivativubol-kofexitage-kefixor-zoruduvemo.pdfIn PDF document text
    • https://niremavepuna.weebly.com/uploads/1/3/4/6/134625676/6945075.pdfIn PDF document text
    • https://tiruvodeg.weebly.com/uploads/1/3/4/8/134892329/xevemuli.pdfIn PDF document text
    • https://damanula.weebly.com/uploads/1/3/1/8/131856109/voginidoxejineki.pdfIn PDF document text
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/vijadoxew.pdfIn PDF document text
    • https://vukasusig.weebly.com/uploads/1/3/4/3/134349680/cf52486ae5.pdfIn PDF document text
    • https://jadojojipolukot.weebly.com/uploads/1/3/5/3/135337887/7054826.pdfIn PDF document text
    • https://zezowamizafomex.weebly.com/uploads/1/3/1/3/131381240/641797.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xotomisen/61669948766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/560a6eea-30aa-4bb3-9998-4afc13e8d7bb/best_treatment_for_gypsy_moth_caterpillar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cdf4430-a21c-4ae1-8139-78c2e8d8b753/wupomuweru.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/3786340844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46051d49-317d-4d4d-8663-d2d30db167c4/how_to_make_turkey_jerky_without_a_dehydrator.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/teaching_cursive_writing_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f44bac2-1791-4bef-b5ba-b5c4ca73425a/vejazipawonenutotiwawu.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/bangla_movie_villain_full.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/965237e3-d476-46a0-8897-684c22d95650/kiwidazisizidedap.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DE 5280 bytes
SHA-256: 369e6d0e63f592000c33c9a16e72db42fd3727f311d16896617e0113aedfe9b6
font_01_sfnt_off0000e6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A7 13860 bytes
SHA-256: 8e21728a74bb4345e597438ddd2e5c0c76d030b76a9bf0f390c54f3aee69fe83
font_02_sfnt_off00011025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11025 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f