Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1bc77e52a2b34b…

MALICIOUS

PDF

81.4 KB Created: 2021-03-07 00:23:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 79888ae7d0f2116ffa0e771d7f36fc7c SHA-1: 75f594b93ceef7d0d18f9148e0b6a62c1d01f799 SHA-256: df1bc77e52a2b34b435c8eca73691e33932b63ce5e9620b4962303cffd4df6b6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. The heuristic 'PDF_SEO_LINK_FARM' indicates the document contains a large number of external links, suggesting an attempt to manipulate search engine results or direct users to malicious sites. The embedded URLs, such as 'https://jacksth.ru/wix?keyword=molar+concentration+calculation+worksheet', likely serve as lures for users interested in educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/wix?keyword=molar+concentration+calculation+worksheet PDF link annotation
    • http://gexomafe.mypressonline.com/85582296057.pdfIn PDF document text
    • http://tonevagewalilu.medianewsonline.com/how_to_write_direct_sum_symbol_in_latex.pdfIn PDF document text
    • http://vizojuzoninunoz.scienceontheweb.net/hoover_power_path_pro_xl_carpet_cleaner_manual.pdfIn PDF document text
    • http://zulurasovuguloz.66ghz.com/vosoti.pdfIn PDF document text
    • http://xusibuvuzos.22web.org/wiwowerixosikejowewuxake.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pivunovukemo.epizy.com/brochure_leaflet_free_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/the_seasons_worksheets_for_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/247f1104-12a4-4aad-b765-06663998aa11/ethical_hacking_tutorial_free_download.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_ee205ececee54cd081d4be356f142b4b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/65413465052.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/bloodhound_gang_foxtrot_uniform_charlie_kilo_bersetzung.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/reprisal_hulu_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/20036081423.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/46267376123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5111f279-3a26-49db-b70e-027f1ebbe4bd/mobejutamekosufubupebe.pdfIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_82c70334820c4402a7ff90a2f1de2abf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ratixifo/74884223826.pdfIn PDF document text
    • http://kewugozosefo.epizy.com/80845291677.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/17907982895.pdfIn PDF document text
    • http://nasewuji.epizy.com/kafidokalexikodakawi.pdfIn PDF document text
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_46f55cd644144d2e85104d79264bcc7e.pdf?index=trueIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_2a6bb9054e1a46289c9298ffc50c5003.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 2932 bytes
SHA-256: 3804a559d20e4185891db6206581e8913b1c0797677716bf750039678bd94d02
font_01_sfnt_off0000fa0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0C 5048 bytes
SHA-256: 456ed32c5cb552adf9f705567b24ad6227e16b3f63b97c17e9e16bb706dbb101
font_02_sfnt_off00010b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4E 14224 bytes
SHA-256: 112cf314c673150cfab114c92625dff4dd6aeb216dddb4e22596ed04bdafc3c6

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