Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc67bbf4720e5b14…

MALICIOUS

PDF

74.0 KB Created: 2021-03-14 22:18:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e9d6189ec1f1323d17b8810e201144a6 SHA-1: f9ad527c177162228c53303ba0bfd4fc0569b85c SHA-256: dc67bbf4720e5b143d3db7be7a765589423bcf39662e72453754af81ebee22be
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spam operation. The primary URL, https://jumiwimov.ru/strik?utm_term=how+to+get+red+bricks+in+lego+harry+potter+1-4, suggests a lure related to a popular game. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its link farm characteristics and potential for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=how+to+get+red+bricks+in+lego+harry+potter+1-4 PDF link annotation
    • http://madoxorijegobe.sportsontheweb.net/vexotavabizelajutanumo.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/us_army_recruiting_office_puerto_rico.pdfIn PDF document text
    • https://cdn.sqhk.co/nijalemivowo/rIZmjen/dizatuwabefupotetuwekigo.pdfIn PDF document text
    • https://cdn.sqhk.co/tifomogoketu/DrUjawL/kerowuwidazuxazigoned.pdfIn PDF document text
    • https://taregegojife.weebly.com/uploads/1/3/3/9/133997559/8955132.pdfIn PDF document text
    • https://gupexududoteg.weebly.com/uploads/1/3/5/3/135302954/8628286.pdfIn PDF document text
    • http://gixapedotamerow.mywebcommunity.org/jarebosaxonazerazedonesel.pdfIn PDF document text
    • https://cdn.sqhk.co/nexoratuxi/chhHigJ/viking_bay_resort_facebook.pdfIn PDF document text
    • https://kukibutojiw.weebly.com/uploads/1/3/0/7/130775835/ac87e591a88b.pdfIn PDF document text
    • http://padojuputiki.iblogger.org/6th_grade_science_practice_test.pdfIn PDF document text
    • https://fimulumalopa.weebly.com/uploads/1/3/5/3/135326017/bavipipawaruxeko.pdfIn PDF document text
    • https://lalupapetawosi.weebly.com/uploads/1/3/2/8/132816164/4465630.pdfIn PDF document text
    • http://meboxofunufox.iblogger.org/jolly_phonics_letter_c_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/jaiigdq/80833366157.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/D0cG3hg/warren_buffett_quotes_on_leadership.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dusexodabedokak.rf.gd/burgmaster_drill_press_manual.pdfIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_24fafb37b5884a008658bdabebdab3ff.pdf?index=trueIn PDF document text
    • http://pasifowon.atwebpages.com/catia_v6_basic_tutorial.pdfIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_04f866c189e64eb8855fc42f3bf94e99.pdf?index=trueIn PDF document text
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_1e6b542e42824c998283bb7a22027f83.pdf?index=trueIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_bacc43ef738a48f3961a6de9b488c289.pdf?index=trueIn PDF document text
    • http://wokarodefi.onlinewebshop.net/hp_photosmart_5520_e_all_in_one_printer_cartridges.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/33047194098.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/73127349720.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/paxowuvakipitikeroso.pdfIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_01e1126fea6643e3ae714d3668874b85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tofizo/estrategias_de_comprension_lectora.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_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 5868 bytes
SHA-256: 067d8621c66afc71a4c3c778230ac23b082a9af1d65b411abbcb8cdb5f348494
font_01_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 11184 bytes
SHA-256: 3672c5af8c19655bef38dd08fc478e0d1943759d9756ce48ef5f9e9da27739df