Malicious PDF — malware analysis report

Static analysis result for SHA-256 d237ddee644def63…

MALICIOUS

PDF

81.8 KB Created: 2021-05-15 21:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bf640831f23a81ff208a708c9dedef3f SHA-1: 786a4e6d32333253555b3701e4e0135e225b8171 SHA-256: d237ddee644def63bd276525e1c05ca1b8657f01c9717c478d8decc6f405427b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high number of distinct hosts and a focus on redirectors. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure points to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://kuzutuzo.ru/strik?utm_term=arris+tm822+spectrum PDF link annotation
    • http://zekojotewakugag.mypressonline.com/rowasavi.pdfIn PDF document text
    • https://wederubumojap.weebly.com/uploads/1/3/5/3/135393822/8466.pdfIn PDF document text
    • http://jazazopito.22web.org/2826174169.pdfIn PDF document text
    • https://wugepazi.weebly.com/uploads/1/3/4/3/134348030/ea558a.pdfIn PDF document text
    • http://boguzimaro.getenjoyment.net/rinime.pdfIn PDF document text
    • http://bejuzoz.iblogger.org/car_key_remote_control_apk.pdfIn PDF document text
    • https://foravozivosuwu.weebly.com/uploads/1/3/4/0/134042788/xaboboveninuxav_kemoxonina.pdfIn PDF document text
    • https://tufubigin.weebly.com/uploads/1/3/1/4/131453284/wemarax-vigovigimaga-tupegopetovozi-sonufujasabofo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fikirifulok.epizy.com/40380594229.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/motatukuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1769856-4742-4a7f-bd67-fb6b4bcbeaa1/51254609344.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/solving_equations_worksheet_answers.pdfIn PDF document text
    • http://tokozod.myartsonline.com/xakifulegumagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9b77cfc-aafc-4114-8091-14a85dde79cc/buwegaruvuzetotusukosop.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/povexiri.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/danilotasa.pdfIn PDF document text
    • http://rajuleneto.epizy.com/carson_dellosa_reading_comprehension_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/jkbose_datesheet_10th_private_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a63b15e4-3ff1-4308-982d-5e234a0a9d4e/kimitewapibelubiduf.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 5152 bytes
SHA-256: 0f07688ce0dd1532b895879c562a16d859780f70a8ee14068683e87cae49df65
font_01_sfnt_off0000fa7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7F 12228 bytes
SHA-256: 3416e69ecd9e7b2049fc1e64223d0d86cc2fbaa18f43d02ed1c4dbb3ab3ab006
font_02_sfnt_off000122e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E7 16168 bytes
SHA-256: 13596defb2bcc6fc1048af8e1a4b019015f57a35384aba88f9e1637b8f94b635

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