Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef18729a06122f6b…

MALICIOUS

PDF

80.2 KB Created: 2021-03-19 16:59:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9a07f1726b9ef9a952de3422b77c7e73 SHA-1: d8708c0292f70f835fe311d779d9a1c173d22741 SHA-256: ef18729a06122f6be72259164c86d4ed56dd5201410a9d7c58b67021b732444c
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 to unknown or potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to replacement parts, likely a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=hp+probook+6560b+replacement+parts PDF link annotation
    • http://sufofure.mywebcommunity.org/how_to_replace_garmin_edge_510_battery.pdfIn PDF document text
    • http://uscreditinquiry.info/croatia_travel_guide_bestu4y9m.pdfIn PDF document text
    • https://negowuvezesat.weebly.com/uploads/1/3/4/8/134859399/626e3e9fde.pdfIn PDF document text
    • http://kinoxca.xyz/nebovapuxisaf7tcn6.pdfIn PDF document text
    • https://xowanejizaki.weebly.com/uploads/1/3/1/8/131871556/1489315.pdfIn PDF document text
    • https://lekumoga.weebly.com/uploads/1/3/2/6/132683130/tapuwisupuxaz-xuwukanagek-vijeti-gorutarosime.pdfIn PDF document text
    • http://rapoxarawiwalo.sportsontheweb.net/what_is_f_in_levenes_test_for_equality_of_variances.pdfIn PDF document text
    • http://xadikefivo.iblogger.org/minecraft_ps4_small_island_seed_2019.pdfIn PDF document text
    • http://tatajosak.22web.org/bodoni_std_roman_font_free.pdfIn PDF document text
    • https://xapewagese.weebly.com/uploads/1/3/4/3/134314981/1191401.pdfIn PDF document text
    • http://mexicotop3.xyz/251026438870m1ku.pdfIn PDF document text
    • http://redpandarecycling.com/exerpeutic_900xl_bikeaqel2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_58351326bd3f458f9450bd3d49ccca53.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/general_information_sheet_2019_non_stock_corporation.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/34535656988.pdfIn PDF document text
    • http://fewufewidi.epizy.com/amiduos_for_windows_7_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/marked_by_king_bs_ashton_answers.pdfIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_4f304051ebc944689d627dcb7479da35.pdf?index=trueIn PDF document text
    • http://zabukek.rf.gd/algebraic_fractions_worksheets_tes.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/2676411271.pdfIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_4174ee68cf944b6082b0a170a5b0d776.pdf?index=trueIn PDF document text
    • http://kegunujav.epizy.com/rigilumew.pdfIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_1b73d24590da4889832cd98fbb395a00.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/bansuri_of_krishna_song_to_ringtone.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_off0000fc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0A 5664 bytes
SHA-256: a9a63588bdf9221856cbe8adf96dc6adfecf6f5bd48b288ede6fa11a1a86c7ba
font_01_sfnt_off00010f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F37 10572 bytes
SHA-256: cf65a3a49fc1f933f87e376250a2cad7fef6ee71d48d99ab4908f40eb23d839f

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