Malicious PDF — malware analysis report

Static analysis result for SHA-256 434fd6056fd260b7…

MALICIOUS

PDF

90.9 KB Created: 2021-02-28 07:25:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a46f7333c45e3dd558e717d282bb7a8c SHA-1: 1d358d82c178a4534b107e454798888d57a941bd SHA-256: 434fd6056fd260b7ed68bc246ac2612b251a0880af048b14ea6ce2e1ca09cb72
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying it as a malicious redirector pointing to 'https://yafferge.ru/strik?utm_term=curso+de+ingles+online+gratis+reconhecido+pelo+mec'. Another heuristic flags it as a link farm, with many links pointing to PDFs hosted on S3 buckets and other domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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=curso+de+ingles+online+gratis+reconhecido+pelo+mec In PDF document text
    • https://rasazumeg.weebly.com/uploads/1/3/1/4/131454762/eb2275368491b9.pdfIn PDF document text
    • http://hot-money.fun/50309447057hzdk5.pdfIn PDF document text
    • http://sdl-trade.com/xapujumazelomifo1awd7.pdfIn PDF document text
    • https://moluzepin.weebly.com/uploads/1/3/1/8/131856103/pudusejufenul-repamenisid-dobule-sezogiku.pdfIn PDF document text
    • http://midomut.iblogger.org/vupiwibodom.pdfIn PDF document text
    • http://byseles.xyz/gefitupupikoluxiravvpnvm.pdfIn PDF document text
    • http://shoop-fg.ru/date_sheet_of_10th_class_2019_hbseg0ok4.pdfIn PDF document text
    • https://rilokudewagozem.weebly.com/uploads/1/3/4/5/134597993/394effcda47.pdfIn PDF document text
    • https://wowiwega.weebly.com/uploads/1/3/1/4/131453904/gaxefexolofafab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/skype_7._42.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/6035377576.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/assembly_rowdy_songs_mohan_babu.pdfIn PDF document text
    • http://doxenobuso.epizy.com/banal_mong_tahanan_chords_and_lyrics.pdfIn PDF document text
    • http://fologipuvug.epizy.com/70438769807.pdfIn PDF document text
    • http://sobakijej.rf.gd/jematoze.pdfIn PDF document text
    • http://begodep.epizy.com/sikemixumisi.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/xejinimewumoxo.pdfIn PDF document text
    • http://jegajumofi.rf.gd/acid_base_neutralization_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/bepinevugep.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/2938172737.pdfIn PDF document text
    • http://parimafilifupev.rf.gd/17447307509.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_off00012386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12386 5392 bytes
SHA-256: c69c676af197063bb83b77afdfc9cd1834f750e665f47d05892e82ce1cff0685
font_01_sfnt_off000135ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AE 12580 bytes
SHA-256: b82332a69f5d2cc82481aa9166befdf404a84cf84c59b6c8b5c30f813600c485

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