Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0551b8d32ea5cce…

MALICIOUS

PDF

81.3 KB Created: 2021-03-15 04:04:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 300bdfb60dd8f4164fdc11f2f639c760 SHA-1: 87ba60fe2ea5baa163fe3b0b4446ac6e1bf070e8 SHA-256: e0551b8d32ea5ccebe8a40f8cb61d4041199a9a316bdf0f41d89f2c083354a01
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous unknown URLs strongly indicate malicious intent. The ClamAV detection and ML classifier further support this, flagging the file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • 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://resalured.ru/strik?utm_term=clarity+xlc3.4+batteries PDF link annotation
    • http://trend-sales.fun/dafupazuki5kjn.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/7vQiap7/zosetufovobiwinazemubu.pdfIn PDF document text
    • http://sibiwuketilivi.22web.org/rejewododubirotapego.pdfIn PDF document text
    • https://rowiteruna.weebly.com/uploads/1/3/4/4/134470704/4832164.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvinudubuno/2hijgPb/runarajugigut.pdfIn PDF document text
    • https://cdn.sqhk.co/datujisukebe/r1vrvic/24784176123.pdfIn PDF document text
    • https://rejurikin.weebly.com/uploads/1/3/1/0/131070637/tonaforoga_desalusisazej_zujosesabinija.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvurero/hJRhffK/spiral_jetty_robert_smithson_khan_academy.pdfIn PDF document text
    • https://toruvorunivigu.weebly.com/uploads/1/3/5/3/135317855/9791791.pdfIn PDF document text
    • http://zuvilivupeke.iblogger.org/jquery_ajax_from_server.pdfIn PDF document text
    • https://cdn.sqhk.co/sirijunubi/r10Lhfh/jutivamosadusifurube.pdfIn PDF document text
    • http://retys.fun/wibuzdujhf.pdfIn PDF document text
    • https://pomulopegodetom.weebly.com/uploads/1/3/1/3/131384256/nakadalila.pdfIn PDF document text
    • https://bokozadag.weebly.com/uploads/1/3/0/9/130969835/suxulujonofew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_0b510605e69b4d5dae31fd0264c2bbc0.pdf?index=trueIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_c9c3fb34a45b495485d067ea3d93698d.pdf?index=trueIn PDF document text
    • http://navezep.epizy.com/bengali_new_year_calendar_1426.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_d648f3fedbd2447595ab1c7f4838ed51.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/21075676877.pdfIn PDF document text
    • http://bimekikup.epizy.com/spoken_english_interview_conversation.pdfIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_7948e456e0c749829195b777fd3e2022.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/snake_game_nokia_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/livro_professional_assembly_language.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/8252827633.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/movivef.pdfIn PDF document text
    • http://zudozam.epizy.com/brush_flair_normal_font_free.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_off0001003e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003E 5292 bytes
SHA-256: 53a383aa30965382c894604c14af38e365fa55a73247e0ef5896982efd2ce799
font_01_sfnt_off00011262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11262 10856 bytes
SHA-256: f0b3346380ff6a2ea1ea8cd5f3db40aa3e70f81c3d2b3043f54a8d0c75db05b0