Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9716cfcc7334451…

MALICIOUS

PDF

78.6 KB Created: 2021-03-28 01:27:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bb0da0e69fce52208f562415eb70d860 SHA-1: 6e7f64b8e6de3d5e475998bb9e0809c926e13df4 SHA-256: b9716cfcc7334451e86e29c5ee6d8c316a0e3093293ae194a68c98f6dd0380d1
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with several pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://seumenha.ru/123?utm_term=chromedriver+74.+0 PDF link annotation
    • http://parkingtest.xyz/how_to_lose_weight_without_working_out_or_eating_healthy1g5m7.pdfIn PDF document text
    • http://gezinuduwep.medianewsonline.com/8840774761.pdfIn PDF document text
    • http://teachost.com/c_programming_software_listqpcuq.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/zakuramamizesamizel.pdfIn PDF document text
    • https://cdn.sqhk.co/woluzadeviv/hehbAWr/dexowopuko.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/fenimowol.pdfIn PDF document text
    • http://future-techno.ru/peresimjf8bj.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/49388514290.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/vhbLijr/light_up_jump_rope_for_sale.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/2283885950.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/nonoxuxexezuxe.pdfIn PDF document text
    • http://bet-info.ru/tecnicas_actuales_de_investigacion_documental_cazaresscac8.pdfIn PDF document text
    • http://xovijezup.mywebcommunity.org/ketiregadid.pdfIn PDF document text
    • https://cdn.sqhk.co/baxikomo/hehjjiZ/kite_robot_transforming_formula_car_racing_3d_games.pdfIn PDF document text
    • https://cdn.sqhk.co/takepoladev/qjeghhi/84677805680.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78a3f932-2eca-4366-91b9-d52a2f3c5f58.filesusr.com/ugd/a586f9_afd5f31188b24ee9907d8e1f84105e6d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/brute_force_wifi_hack_apk.pdfIn PDF document text
    • http://betakudo.atwebpages.com/57944416401.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/abnormal_liver_enzymes_guidelines.pdfIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_56171afbc20d4b4e8b00ab0cf9fc45a4.pdf?index=trueIn 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_off0000f940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF940 4952 bytes
SHA-256: 70d305b538fee6eb37d6d8b06850714d964d3be7d1500ee7323483628f03389f
font_01_sfnt_off000109fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 10456 bytes
SHA-256: 8b5b4b815f6005acbfe88a2ba408b7cded7f7e0d5026b701d5ec59b328bdfe89

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