Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c2e581f5dc6a7e…

MALICIOUS

PDF

66.6 KB Created: 2021-03-06 03:02:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 09cc2d5c33d264068ead655ca714c1da SHA-1: bfad73720fd3bec910f54cf751710a98dd1c8063 SHA-256: 61c2e581f5dc6a7eb08418bc8e85ecc4886864ea034e04e36dcce212d5f4ea56
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 or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wb?keyword=oxford%20english%20grammar%20pdf%20for%20class%205 PDF link annotation
    • http://jelelegukawox.22web.org/samsung_galaxy_tab_ce0168_features.pdfIn PDF document text
    • https://cdn.sqhk.co/minederepa/giWlhc6/nonasojapa.pdfIn PDF document text
    • http://funiwigurogamu.iblogger.org/starbucks_barista_training_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/zufosupiz/iSgfibW/bodogowetotuxoto.pdfIn PDF document text
    • http://vorakumezaxof.mygamesonline.org/how_to_build_a_sturdy_bridge_out_of_toothpicks.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/vgjIXRD/rema_tip_top_careers.pdfIn PDF document text
    • https://wegefaraza.weebly.com/uploads/1/3/4/7/134703567/jomuje-duzino-rozig.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/1123936.pdfIn PDF document text
    • http://bovibuvebus.getenjoyment.net/metodologia_de_la_investigacion_sampieri_5ta_edicion.pdfIn PDF document text
    • https://cdn.sqhk.co/wefopijupe/hhjitEE/togidu.pdfIn PDF document text
    • https://piledefek.weebly.com/uploads/1/3/5/9/135966078/1095340.pdfIn PDF document text
    • https://cdn.sqhk.co/mitugejaxel/jicjijc/16549316771.pdfIn PDF document text
    • http://movajapenakinu.22web.org/christmas_activity_worksheets_for_middle_school.pdfIn PDF document text
    • http://bonaletikireje.iblogger.org/11300890386.pdfIn PDF document text
    • http://kuboduzuke.mypressonline.com/letter_to_my_nephew_on_his_second_birthday.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/basic_maths_formulas_in_hindi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fegerig.epizy.com/why_riba_is_prohibited_in_islam_and_what_are_the_rationale_for_riba_prohibition.pdfIn PDF document text
    • http://migusopugaj.epizy.com/nutrition_information_red_chili_flakes.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/42409595551.pdfIn PDF document text
    • http://fibilizovowudux.epizy.com/microsoft_office_tri_fold_brochure_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC889 5788 bytes
SHA-256: 119e4f996ef998e7a2538aa3ba3faf7131f99cd8ab0945e465de132af2df271b
font_01_sfnt_off0000dc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1D 9520 bytes
SHA-256: 4db39f81c71436b4c71fd36a58a8bbb1b7d2552aeffb32c13eb5fb38f90b27f2

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