Malicious PDF — malware analysis report

Static analysis result for SHA-256 daae0c887681a378…

MALICIOUS

PDF

78.1 KB Created: 2021-04-06 23:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 899321faca2942b70069e8bfea5ccbb0 SHA-1: dd7cc9ba21957b8d2c5bf417814c73721fe32581 SHA-256: daae0c887681a378e5af74640e707b3f9747793b1deb79b363af82aa602b83b7
244 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many pointing to disposable hosting, and one critical link to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to a 'body language quiz'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/award?keyword=body+language+quiz+with+answers+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4471082/normal_5fd673a5a8de0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405414/normal_5feb0daa22d14.pdfIn PDF document text
    • http://lijonotogi.scienceontheweb.net/search_strategy.pdfIn PDF document text
    • http://tedurelaseji.mygamesonline.org/13072602177.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_8268f495a5c648439934d56ad42c4eec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba36dd4-a45c-4213-8afe-26653dbb1f1e/73623801743.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/21451759387.pdfIn PDF document text
    • http://revodez.myartsonline.com/mujewa.pdfIn PDF document text
    • http://vekisofekibote.myartsonline.com/accountancy_project_for_class_12_cbse_2020_15.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/oracle_database_12c_administration_workshop_student_guide.pdfIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_a54291ffaedd4162b445afaa543ca065.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sabegokek/baligitavomevezojuzexodon.pdfIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_18590953a18e493c99159f75774d7fad.pdf?index=trueIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_5e2b5294f3144975beda5d7a0edd7e67.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c818565-3b17-4531-8b7e-de5cf54711d9/how_to_make_a_reflection_paper_example.pdfIn PDF document text
    • https://7a6021ad-ea99-40b3-bafb-6570e045b460.filesusr.com/ugd/527ec5_04334d4a56ed4adea6bf91c6c1617227.pdf?index=trueIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_295b85bd8bbc4a468d2c728c3e3730fd.pdf?index=trueIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_23e6063034294587a9420ee3f2636ed2.pdf?index=trueIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_854523be13e649a9826387f4eaa82f52.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 5720 bytes
SHA-256: fbc63aa55e2c8b8570e4bfbf7829fcad5b852c224c033ef426b33a9a9e7f2d73
font_01_sfnt_off0001044b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044B 11460 bytes
SHA-256: 8bca641699824e7bf6ddc4d3076f869503867d70d1c407c0f229c69e3940e8e1