Malicious PDF — malware analysis report

Static analysis result for SHA-256 37639980d1c991a9…

MALICIOUS

PDF

47.3 KB Created: 2020-10-10 13:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 97583c7021fc9a1484232754369cf37d SHA-1: d3338a437348a9e7540ffad62a735e284caa9932 SHA-256: 37639980d1c991a912e3f59ddb9fa29afd64c965a19c0ca27cd236efea9aeab2
154 Risk Score

Malware Insights

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

The PDF contains a lure related to "new congressional staff orientation notes" and embeds a large number of links, including one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The embedded links likely lead to a link farm or further malicious content, aiming to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://ggtraff.ru/pify?keyword=new+congressional+staff+orientation+notes+answer+key In PDF document text
    • https://site-1038567.mozfiles.com/files/1038567/vufajasojiluxaliko.pdfIn PDF document text
    • https://site-1039753.mozfiles.com/files/1039753/zujazelaw.pdfIn PDF document text
    • https://site-1040878.mozfiles.com/files/1040878/sezomafotegorekobaleriku.pdfIn PDF document text
    • https://site-1038353.mozfiles.com/files/1038353/gozosolagubovovak.pdfIn PDF document text
    • https://site-1036838.mozfiles.com/files/1036838/381257824.pdfIn PDF document text
    • http://files.eisenhowertheater.org/uploads/1/3/1/6/131637307/fiwumafijowitugelegu.pdfIn PDF document text
    • http://jerivav.rickwilliamsart.com/uploads/1/3/2/6/132680813/zupuzogubudozex.pdfIn PDF document text
    • http://voloja.wendyleach.com/uploads/1/3/2/6/132680981/bepufovivujugo_pekedinigu_sumusubelafe.pdfIn PDF document text
    • http://files.rigsbybuilders.com/uploads/1/3/0/7/130738620/kiwoboxisi.pdfIn PDF document text
    • http://bulaz.faithsforsafewater.org/uploads/1/3/1/3/131383548/xijikepibovun.pdfIn PDF document text
    • http://files.notjustenneacoach.com/uploads/1/3/2/8/132815019/wenurano.pdfIn PDF document text
    • http://files.modernnaturefilm.com/uploads/1/3/0/7/130740123/7141944.pdfIn PDF document text
    • http://wijeguvi.musictherapywithshari.com/uploads/1/3/1/0/131070305/kugoju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/5269/9300/files/21930246913.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6750/6325/files/impossible_quiz_answers_question_56.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/dracula_essay_topics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4387/5737/files/warframe_trade_tax_calculator.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_off000079e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79E6 5276 bytes
SHA-256: ce71bcc42d19d8bb907cbe5a42f0f8856645f2996fc13f784c41d08a68c27472
font_01_sfnt_off00008c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C04 10600 bytes
SHA-256: d4749e5e975054a4c69a51584bf1a66b4358e39b9bc18a615757c0f7252411c9

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