Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bdb654bcadf2468…

MALICIOUS

PDF

97.6 KB Created: 2021-03-22 15:27:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 593ee265e81a5e440f5e6c85f4ccb6aa SHA-1: 9fad66496deb4463ae13b82a3b097f3e098fc096 SHA-256: 0bdb654bcadf24682359b5ac3f24eb76bee40bc65e7c06714434c0b65674e126
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to other PDFs hosted on various domains, many of which appear to be disposable or used for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a link farm designed to lure users or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/award?keyword=bladder+training+journal+pdf PDF link annotation
    • https://kijapipova.weebly.com/uploads/1/3/1/4/131407887/c1e1e6185699d.pdfIn PDF document text
    • https://mosuvixixe.weebly.com/uploads/1/3/0/9/130969854/a64a8ec.pdfIn PDF document text
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/7605048.pdfIn PDF document text
    • http://naturalm.space/gitapipekugivipusilagawhxt0v.pdfIn PDF document text
    • https://bopovajo.weebly.com/uploads/1/3/5/9/135966354/2049654.pdfIn PDF document text
    • http://retys.space/pefafiteh5xy0.pdfIn PDF document text
    • https://fujulisu.weebly.com/uploads/1/3/4/0/134042697/3490467.pdfIn PDF document text
    • http://copyrightsupporteds.com/69736369591bx4fe.pdfIn PDF document text
    • http://basvuruizleme.online/26378158280ci2px.pdfIn PDF document text
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/fee21a.pdfIn PDF document text
    • https://jonomivebotuw.weebly.com/uploads/1/3/4/6/134683751/1638870.pdfIn PDF document text
    • http://woodbonus.net/28874131572b05wh.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/45064347969rqfq4.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/brown_v_board_of_education_of_topeka_was_a_significant_supreme_court_ruling_because_it1plrp.pdfIn PDF document text
    • http://voicebftyi.com/schwinn_deluxe_bicycle_child_carrier_manual5er04.pdfIn PDF document text
    • http://uablog.website/fuzududafarojia3pn8.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/essence_anatomy_book_downloadh7qtp.pdfIn PDF document text
    • https://pupadidaf.weebly.com/uploads/1/3/0/8/130873798/7543381.pdfIn PDF document text
    • http://sumemejosanavo.iblogger.org/biblia_lenguaje_actual_gratis_descargar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gimobomir.epizy.com/fosepadapameg.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_off00012d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1B 5156 bytes
SHA-256: 461a56ddd7ded683a21e6f89243dd9232a60d27230f72e3e23bf0551160d3b43
font_01_sfnt_off00013ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC0 10900 bytes
SHA-256: fec1618294b2359528f3ea6dcceeb1c26c2dd25ac7ca3db45063e82a3c7527ff
font_02_sfnt_off00016413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16413 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d