Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec36efeb56960e05…

MALICIOUS

PDF

76.3 KB Created: 2021-05-14 10:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 751f1e4a36347a4c4cd0260acf19d543 SHA-1: 75522bbaed6f34a16d281ab5704d0f9c5a4a8b5f SHA-256: ec36efeb56960e0528d9c2b822e7ae240886e9f1bfa3b8edf86855d934c6fab1
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, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jumiwimov.ru/strik?utm_term=seiko+solar+chronograph+v172-0ar0 PDF link annotation
    • https://jebapawobukil.weebly.com/uploads/1/3/4/5/134521284/5a0d818223.pdfIn PDF document text
    • http://wofatis.22web.org/post_gastric_sleeve_diet.pdfIn PDF document text
    • https://waguwejulunesu.weebly.com/uploads/1/3/5/3/135301122/6903650.pdfIn PDF document text
    • https://zanasebumafuwaj.weebly.com/uploads/1/3/4/8/134899829/giruxomuvebifeb-libopas-befusowiraketet.pdfIn PDF document text
    • http://instup.xyz/how_to_do_kendoof6og.pdfIn PDF document text
    • https://sufafiderek.weebly.com/uploads/1/3/0/8/130814754/rovuzegerowumij-nuluwu-xapozafarezovo-lojenovu.pdfIn PDF document text
    • http://botefedej.sportsontheweb.net/fitopejagulivikepatudiro.pdfIn PDF document text
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/1180691.pdfIn PDF document text
    • http://kosolibanun.iblogger.org/26732403378.pdfIn PDF document text
    • https://bivuremopukojez.weebly.com/uploads/1/3/0/7/130740249/galadabu.pdfIn PDF document text
    • https://xafusotegemuwif.weebly.com/uploads/1/3/5/3/135304795/tisatagoxap.pdfIn PDF document text
    • http://aycotoro5.xyz/49037068407lfxhk.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
    • http://regaguw.rf.gd/purpose_of_a_restaurant_general_manager.pdfIn PDF document text
    • http://xozodijavoxovun.epizy.com/when_parking_downhill_in_a_car_with_a_manual_transmission_you_should_park_with_the_transmission_in.pdfIn PDF document text
    • http://vawirir.atwebpages.com/nesijulepobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d824781-6025-4aaa-845f-1fca67719289/a_que_movimiento_literario_pertenece_la_familia_de_pascual_duarte.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/887a39e2-8186-4559-8117-47f51ae3a076/81596249710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f3f07f8-5693-4f7f-9d5e-04b69b0ebfcd/ruros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a021f9ac-4a5a-4a4f-94ba-1ae4d139f10f/fuwoxiv.pdfIn PDF document text
    • http://kotuwelu.rf.gd/20300045030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61a11d73-505f-42e7-b119-2a5bdd8299a9/vigotepojuwumijotixuzoga.pdfIn PDF document text
    • http://gajutar.onlinewebshop.net/editable_bingo_template.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_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 5568 bytes
SHA-256: f1985e0e061709ad17707b2abd731fdf6572f59d57687fb2513c468d65419e04
font_01_sfnt_off0000eef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 11176 bytes
SHA-256: fbcf97fbd4f7f56c5eb55f8cfbc8ea92048c2027f1b5266990337b9b4bf9cfc3
font_02_sfnt_off0001136d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e