Malicious PDF — malware analysis report

Static analysis result for SHA-256 a250f1fcd76b0f01…

MALICIOUS

PDF

102.3 KB Created: 2021-03-17 07:15:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3978dc187f01895285c930a9129e159a SHA-1: f36946c9363e9eed283f72144741d81b6f6caf45 SHA-256: a250f1fcd76b0f01afe673c44b0e057d2cba24aebf455709563004b478f3386f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating an attempt to distribute content or malware through a network of linked PDFs. The presence of external URIs and the ML classifier's high confidence score further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://maypoin.ru/award?keyword=bring+up+genius+pdf+%25D9%2585%25D8%25AA%25D8%25B1%25D8%25AC%25D9%2585 PDF link annotation
    • http://mamafiposorugul.sportsontheweb.net/01_de_maio__feriado_mundial.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzitomizaj/Sjdicjb/wenabumasudifexirewova.pdfIn PDF document text
    • http://migipobazu.mypressonline.com/physiology_coloring_book_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/basinasedu/gjija6E/retro_game_center_emulator_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gujurolekuma/hbifPUB/29795303568.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/iihjge9/49694927639.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a181bb3e-7445-4f1f-a1cf-b2fe66c13e92.filesusr.com/ugd/91ce54_6a4d5d4a0a5a45cf9f7d1274bce7ffaf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a844f0f-98fc-4c92-864b-3af4468c320d/zaduzeridi.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/libijetexabi.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/numanabefodalitaxit.pdfIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_5837d87485f44968836a0f8b952882d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/finix.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/equipment_world_spec_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29d89e6b-44c7-43ba-935b-cdfdf4e8167d/nebaxasenipinumemavasareg.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/whatsapp_plus_baixar_android.pdfIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_06129fde9d5b409ebc2cfaa61f7991e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeroguru/20445310788.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/is_ki_a_compound.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/gangster_games_phoneky.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/social_media_marketing_business_proposal_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/b_d_easylifter_model_305_manual.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001534b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1534B 29692 bytes
SHA-256: ff0fc4b5b86f8e1dd2e14d14c236f08fc87bd5f41d512d025d638206341077ff
font_00_sfnt_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 6832 bytes
SHA-256: bfe39baa656defdf4f8b5cac988ef1f714559f5dddd620217125fb14b328de4e
font_01_sfnt_off000105a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A2 5016 bytes
SHA-256: 724c05e37b5a71736c58c4108992e2f53da8629b15c4da2941b9c1fee22c9490
font_02_sfnt_off000116d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D0 10900 bytes
SHA-256: 5b85355c6245f9b6f6bfe76997ccb1dc31656d85130ac22f90195214f60a6225
font_03_sfnt_off00013bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDB 16728 bytes
SHA-256: 9300ad5b093cfbbc12cd7640fbcdad0af0d7da5b98370cbcca033f004c4a09c7