Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba71cdf2b924b027…

MALICIOUS

PDF

128.6 KB Created: 2021-04-04 03:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0331aaecce5b65d42bae106ca6301eff SHA-1: ea0aea75743dd2103cff2474693d9444d7ece91d SHA-256: ba71cdf2b924b027ba62ea1907b6cdcb91bc80ef903d84351c81ebeb6579d2af
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary purpose appears to be directing users to a multitude of other PDF documents hosted across various domains, suggesting a tactic to manipulate search engine results or distribute potentially malicious content. While no scripts were explicitly extracted, the nature of the link farm and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=behaviourism+definition+pdf
    • https://mumizovis.weebly.com/uploads/1/3/4/3/134350635/xumefuxowagabope.pdf
    • https://gunajogozezulom.weebly.com/uploads/1/3/5/3/135385825/luxes-xaxeromapeta-fijuk.pdf
    • https://ruwixotuso.weebly.com/uploads/1/3/4/1/134131383/wovegepegawurosa.pdf
    • https://munopufunorari.weebly.com/uploads/1/3/4/8/134881547/voduwilalifugum-sudimekamuligi-rojusejuridoz.pdf
    • https://forelidik.weebly.com/uploads/1/3/0/7/130775511/2437351.pdf
    • https://kowumawadixowiv.weebly.com/uploads/1/3/4/8/134888970/fabadagujoloneb_lakatujolezene_dojenepu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zedapubijudubux.rf.gd/math_quiz_for_grade_4.pdf
    • http://sajififavaw.epizy.com/my_bkash_app_apk.pdf
    • https://uploads.strikinglycdn.com/files/43e53982-2987-4796-a4c8-10c1dc79747a/63867919114.pdf
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_2551adbfccd74c3799332660ab068d76.pdf?index=true
    • http://gomupinoteripa.epizy.com/division_practice_worksheets_4th_grade.pdf
    • http://sasofinifujilo.epizy.com/samhsa_anger_management_workbook.pdf
    • https://5ec50ee2-6c76-415b-b731-82d7de26534b.filesusr.com/ugd/826e74_903ef64cc9cd442bb7c87a8146833e7a.pdf?index=true
    • http://lujubozugib.epizy.com/43815234500.pdf
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_466b7904488241f890951cf56444adc6.pdf?index=true
    • http://ripizidogiga.rf.gd/how_to_port_mobile_number_airtel_to_idea.pdf
    • https://beea745c-e446-4317-9ad8-fe501d584c0a.filesusr.com/ugd/9196db_3d3f72c80e7546cf80fac59a6a17218a.pdf?index=true
    • http://towupew.epizy.com/9318016324.pdf
    • http://vixuzuvubus.rf.gd/49762130309.pdf
    • https://uploads.strikinglycdn.com/files/17bda814-a6fa-4bcc-b26e-79441ae80965/the_lord_of_the_rings_movies_in_order_from_first_to_last.pdf
    • https://uploads.strikinglycdn.com/files/30c1407f-7ea5-4820-beb5-1b30da3be8fb/how_big_is_30_cubic_feet.pdf
    • http://bolororufe.rf.gd/bifebulubov.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b5c8.bin
6e391811f1b5a09f31cd451020b18fe98ff6bb9055f10def3158ca7a042d56e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5C8 5356 bytes
font_01_sfnt_off0001c7e0.bin
f7f4feffcb28aebfae551dd240fcac99bea32c2880d297dd2cba73259bf9851d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7E0 13048 bytes

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