Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2b598ef7f7673f…

MALICIOUS

PDF

83.5 KB Created: 2021-03-17 07:51:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fa840fd0dcdbf1af50e8463d217581fe SHA-1: b967f5e5c931b4518929390dee5817dfbab09d6c SHA-256: cb2b598ef7f7673f9635831319ff14c3e672442b4e4251fa1cbaf41df60da930
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though partially corrupted, suggests a lure related to calculating forces, which is used to mask the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+calculate+the+magnitude+of+resultant+force In PDF document text
    • https://cdn.sqhk.co/wafifovuwel/iadgejf/magical_alchemy_set.pdfIn PDF document text
    • http://mobutadaxez.medianewsonline.com/59314185169.pdfIn PDF document text
    • http://sunazeremitiwu.mypressonline.com/karakteristik_ajaran_agama_islam.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/how_a_bill_becomes_a_law_board_game_lesson_plan.pdfIn PDF document text
    • http://roxopazin.iblogger.org/9th_grade_vocabulary_word_list.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/breakfast_nook_building_plans.pdfIn PDF document text
    • https://cdn.sqhk.co/bibobovezave/iijw8WP/the_complex_adventures_of_gumball.pdfIn PDF document text
    • http://pobadabodoz.scienceontheweb.net/12528695225.pdfIn PDF document text
    • http://dokojekiferej.mygamesonline.org/probability_theory_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/dhjgcge/muvarowidemerurason.pdfIn PDF document text
    • http://bopugafuwu.scienceontheweb.net/bagaxonijumeva.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxarulenogu/zgemig3/word_nut_level_117.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/rsjb2ij/how_to_draw_marvel_logos.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/10084782133.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/how_much_is_a_2019_peterbilt_389.pdfIn PDF document text
    • https://cdn.sqhk.co/tenalewi/8ih0jeW/real_car_parking_master_street_driving_2020_download.pdfIn PDF document text
    • http://zomaragexavope.sportsontheweb.net/wanatofumekibadaravasu.pdfIn PDF document text
    • https://cdn.sqhk.co/ratijojitud/Zjdm0qW/business_startup_checklist_canada.pdfIn PDF document text
    • http://julivojurukumu.sportsontheweb.net/what_is_omb_circular_a-11.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://jarifixe.epizy.com/63717873048.pdfIn PDF document text
    • http://dilexaluv.epizy.com/74821699258.pdfIn PDF document text
    • http://dogirajuwuxo.epizy.com/kuzefofoniwerij.pdfIn PDF document text
    • http://lipabarud.atwebpages.com/garefexe.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_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 5372 bytes
SHA-256: fe7233035bc71051647ef161c57f30fe08edd7a0be3920db7afbba3da2bb464a
font_01_sfnt_off000109db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DB 11700 bytes
SHA-256: 11f5ed2fbff4571baff6fe80d069a68dc002655063011f6cd6587bdfa985fbaa
font_02_sfnt_off00013211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13211 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378