Malicious PDF — malware analysis report

Static analysis result for SHA-256 440e16f95ea4052c…

MALICIOUS

PDF

100.3 KB Created: 2021-05-19 17:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9c15c54c010f5663c1c3ad93af64df65 SHA-1: 04b95e197946dc78fcd6c55a5fd32cdc2b900485 SHA-256: 440e16f95ea4052c371a6eb73595644ed4fa8ec404e1a6e0987eb7f16f60ca1c
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary malicious URL identified is https://xajibur.ru/strik?utm_term=descargar+among+us+para+pc+mega, which appears to be a lure for software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • 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://xajibur.ru/strik?utm_term=descargar+among+us+para+pc+mega PDF link annotation
    • https://wobakasufafe.weebly.com/uploads/1/3/2/6/132682589/7f598fe.pdfIn PDF document text
    • https://nebegixemavo.weebly.com/uploads/1/3/4/3/134359619/virurusonu.pdfIn PDF document text
    • https://buwigare.weebly.com/uploads/1/3/5/3/135308802/7955079d.pdfIn PDF document text
    • https://tabutepapuwup.weebly.com/uploads/1/3/0/7/130740025/biwofobez_pidopim_nopase_ribawilemebav.pdfIn PDF document text
    • https://nifiwaratobiwe.weebly.com/uploads/1/3/5/3/135346776/folagawafufugat.pdfIn PDF document text
    • https://fabimevedojepa.weebly.com/uploads/1/3/4/6/134678150/runorovud_losedina.pdfIn PDF document text
    • https://vatedubajepe.weebly.com/uploads/1/3/4/3/134371970/bd80a84.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6df69929-4129-42f5-a724-a43076106c98/how_to_fix_ignition_lockout_on_furnace.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/59774109615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db895dc6-fcd1-4c3f-a515-cad54d33e716/29643855721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba2ef735-316e-4038-b3a1-29d145b39f2a/36148377646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e3bab3-3c9e-4788-aaf1-f5e21ef7c70e/bopowawutuxuvewapugi.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/witagepigaluninojir.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/latest_google_chrome_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/how_do_you_reset_aqua_logic.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/27554911952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/243c7659-951e-4a12-ab7d-b8e8eacb1eee/tememafazuzogimemo.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/hernia_inguinal_slideshare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af53d880-93c2-4f57-b01b-ad1be8df3567/gisakatudosilotuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fdc9e7b-0937-4376-9146-6bde573582d6/100_question_bubble_answer_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f79d7956-28ab-48e0-aa5c-4dd90f050282/thetford_toilet_cleaning_instructions.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001019f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off00011255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11255 3016 bytes
SHA-256: cbb52481ce94e16f1aa7c1e5556943e0858c32639ae52c58d7d3596933ba349e
font_02_sfnt_off00011d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D11 5220 bytes
SHA-256: ac44bbd7ef45c68eb3496c993ca6ce3767b19619f4849f93cd779fb5c727c3c4
font_03_sfnt_off00012ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC2 4888 bytes
SHA-256: 225ef659cfc26eaba513d09142444c86a05324941de5b944ca8cbf442cabfd4f
font_04_sfnt_off0001416c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1416C 12544 bytes
SHA-256: 6b88f6ee3e3c24c81cc3da425bcb49a0e214581f2425235a0495041d66b4864c
font_05_sfnt_off000169bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169BC 16448 bytes
SHA-256: 6cafa32eaf765a1687f708f8f3b8acee7e9c026db2553f3b150e04893e5bd48d

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