Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa59d824b0e578c…

MALICIOUS

PDF

95.4 KB Created: 2021-03-25 04:41:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a8483dd731592921edea7f9c300a238e SHA-1: 1b42e2bdfa9d5c10a10990f127ad69198fb40dd0 SHA-256: aaa59d824b0e578c2982ec0586a0292ae99361bebfc807a8a45c4f84ecfb8c1b
244 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=field+trip+reflection+worksheet+high+school In PDF document text
    • http://fakutavavuzixin.22web.org/how_i_learned_to_drive_full_free.pdfIn PDF document text
    • http://liteponezugom.22web.org/romeo_y_julieta_resumen_en_ingles_y_espaol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gaxijejazaxedaj.epizy.com/75820360236.pdfIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_fc9b4d6cb1c94f9895e85d954762709f.pdf?index=trueIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_5326fe44c04248a9a4ed9a32a659ef27.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/affdaea5-0fe9-4c50-9e29-ef5018313e5e/how_to_solve_a_rubiks_cube_oll.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_4499f790b6094a73bd6eafc5903edd59.pdf?index=trueIn PDF document text
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_274378f252d14e29a55996e5d4e9917c.pdf?index=trueIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_e283dfd9b3894ee8bface5ed4b77b6e5.pdf?index=trueIn PDF document text
    • http://vaxikexuso.rf.gd/42451246295.pdfIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_e15565c950b64bcebcbc7b26cc368adc.pdf?index=trueIn PDF document text
    • http://velewetuwo.rf.gd/piguduvonajalutu.pdfIn PDF document text
    • http://bulekixor.epizy.com/bailey_and_love_27th_ed.pdfIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_cc5528f851024c60b25b660836c680c9.pdf?index=trueIn PDF document text
    • http://jigezadoxari.epizy.com/zovelakulizawozuvazevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a5ce250-0d2d-4ba9-9e9a-7bb79854f2ed/39640964109.pdfIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_79ae88bc074a4506a5d4ed7ff7dd4642.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b13e272e-ee0f-4442-8992-5a56329559bd/12107504664.pdfIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_167507ee8b1f4389a91dcf30f09ee7fd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2595529-163c-4fc4-a7be-c239d2c83e3c/77936509177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8004a216-b553-4b48-9efb-cf8e7a822945/bazuxexojiteginawefu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12134 5316 bytes
SHA-256: 44a44250c6f65b27449a85a58661440d1191c720d37d378cea98a00f04f43c48
font_01_sfnt_off0001335f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335F 11996 bytes
SHA-256: e7b19ad6c56cbf74bd09358d302918ee9ea726874c8f1b4d1918715e4dfa057a
font_02_sfnt_off00015b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B24 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7