Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f52055bfb9e049…

MALICIOUS

PDF

68.0 KB Created: 2020-12-18 15:08:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 79d7da7d9754dae32db0a1ec42fd04fd SHA-1: 93c870335ed99fa4e83d49d24d1d089f5d568044 SHA-256: 92f52055bfb9e049343bc5cd3684e721bcc3add9a89e1257c951f9bc6577aa36
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://traffset.ru/strik?utm_term=multiplying+integers+worksheet+6th+grade PDF link annotation
    • https://kufojomarolov.weebly.com/uploads/1/3/4/4/134401526/51809.pdfIn PDF document text
    • https://zukepuroxile.weebly.com/uploads/1/3/4/7/134746995/54606.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0e110403f5353fd95a22f/t/5fc2627018e72e5fdb24d4e4/1606574707794/45651828372.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/point_of_view_worksheet_12_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/wodojuduwatodavumesuputi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdfca93c6ccf69f3249e10/1606286505940/21667846742.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/fers_retirement_planning_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/41076025666.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/89457868946.pdfIn PDF document text
    • https://s3.amazonaws.com/suzitivasekoga/29088636896.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/78628269807.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0696cdf132613bbbb46ad/t/5fc0d96d61e25426e1580ee1/1606474095367/ryobi_blower_vacuum_bag.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/epic_sax_man_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/azonto_for_jesus.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/how_to_install_a_larson_storm_door_closer.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/champak_comic_book_in_hindi_download.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_off0000cb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB70 5640 bytes
SHA-256: 07c43358992a6fffde0fec442b8c079ef5f9ad857088d501955b2fda1437d041
font_01_sfnt_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 10700 bytes
SHA-256: 27bbd666febe0593fdb1045a55d51e45528af9a9f2e326027acab540b67cba38

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