Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f69c6a51d2586e…

MALICIOUS

PDF

79.6 KB Created: 2020-11-11 01:26:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 05dbe3777304ac6130ee1100c0e50782 SHA-1: 190baa5588c0f6eb5a9c85a1ded1bfac592c43bd SHA-256: 81f69c6a51d2586e9e456dbcaac94de9e36fc76b1b4da8336c3a951df43b4a3d
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing lure or a downloader for further payloads.

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://traffine.ru/123?keyword=tamiya+frog+manual In PDF document text
    • https://tenimevu.weebly.com/uploads/1/3/4/3/134315692/b7ff23b7e.pdfIn PDF document text
    • https://dogamoduxex.weebly.com/uploads/1/3/4/4/134481485/gamom.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/1014041.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/dixaleko/bugafijugidutik.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/the_egypt_game_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/90398254427.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/netgear_c6250-100nas_ac1600_range.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/information_theory_and_statistical_learning.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/4387940954.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/the_mint_apartments_in_charlotte_nc.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/drivers_manual_nyc.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/fijajopamazomuzotokifeguk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a98924b4-fca0-4a98-86fd-465cb9bdbdb7/i_am_number_four_free_download_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/68112958626.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD468 4960 bytes
SHA-256: dd582ea3bca4bb1453a64c3a289727c4eda0e15e956023c80808771007d0ee46
font_01_sfnt_off0000e53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 3940 bytes
SHA-256: 2092d174cc2bef6b6a327dfb40e22eb60944abaf8c8379bb4b2d48b9f7921af8
font_02_sfnt_off0000f3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EE 11144 bytes
SHA-256: 79ae4b3ff405e93b2b16ce00ca0b61350ee57dfa7828bb6176078aef321ea3b4
font_03_sfnt_off00011a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A27 16144 bytes
SHA-256: 2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174

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