Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed85703076b3b636…

MALICIOUS

PDF

78.3 KB Created: 2021-03-28 12:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 739920b89a35f1d25addaec063320c9c SHA-1: 5c7203fd29b55776d7c68bb6cbc84fc665bceccd SHA-256: ed85703076b3b636e1b5c69a5deba8769d6a5e12009d6ffcb37d56fbbb263c4e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate document titles, indicating a link farm or SEO spamming technique. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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://midufefew.ru/award?keyword=awaken+the+giant+within+full+book+pdf PDF link annotation
    • https://cdn.sqhk.co/penutizufib/kgjrjhr/metronome_beats_pro_app.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/4jfHY2F/spina_bifida_symptoms_while_pregnant.pdfIn PDF document text
    • https://buruwezixefekiw.weebly.com/uploads/1/3/0/7/130738548/ladifesixamanapida.pdfIn PDF document text
    • https://xonarupitowij.weebly.com/uploads/1/3/4/6/134617661/rigasagovevusob-tofuvasadure.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/AjhihI3/kebulufoda.pdfIn PDF document text
    • https://cdn.sqhk.co/fivuwunar/34hg1X6/house_music_radio_stations_los_angeles.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/jhEJgeC/91411927544.pdfIn PDF document text
    • https://xolojafiwonizup.weebly.com/uploads/1/3/5/9/135966724/280c026f75f681.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/takateg/sort_excel_spreadsheet_numerically.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/feeling_songs_kannada.pdfIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_9849798444c84062af630267b22a9cdf.pdf?index=trueIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_e3e46d728fc141449e0a69dc28f62a9a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/dream_come_true_song_free.pdfIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_0b00d5fb97eb4e4c8f7a8bd65c238c8b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/c_compiler_for_windows_xp.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/69892011151.pdfIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_10db18fb6a2a4d49a9dfbc887db8bf4b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c224891d-4280-4915-abe5-215a87203bdc/sosurejuluworodisutuwib.pdfIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_01c656cecba64b3fb88d490d4dd86507.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavabi/lowrance_x47ex_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/gibowiguvobebexavawinub.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/osha_requirements_for_flammable_storage_cabinets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65faa089-bd27-45ce-831d-8bdceec8c9ff/how_do_i_use_the_brother_fax_machine_575.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_off0000f35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 5316 bytes
SHA-256: 20bd0c73d391defbde8a3b22ba4e46a3b311a483791237e86cf2060ec0b0ca31
font_01_sfnt_off0001058b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058B 10744 bytes
SHA-256: 4893348a1fedb1fee8daf4d9212f40f5abbc169af0535054353f064a94e92796

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