Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b565a08e875da92…

MALICIOUS

PDF

113.3 KB Created: 2021-03-13 21:10:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 7f30a0a25ce27f33a024e2ff7bfd39ef SHA-1: 974cd9affe574758a465c0eeb90442e080de5e16 SHA-256: 4b565a08e875da9213f2e56d011bbc019fd08dad4e187c3240ab25b0bca6fc56
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, with many hosted on disposable domains, suggesting a link farm or SEO manipulation scheme. The presence of multiple external URIs and the overall structure point towards a phishing or malware distribution lure, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/award?keyword=shani+ashtottara+shatanamavali+telugu+pdf PDF link annotation
    • https://cdn.sqhk.co/waxuniwite/ORhaD9Z/physical_science_shs.pdfIn PDF document text
    • http://homebig.space/kuweboxafimrab6i.pdfIn PDF document text
    • http://domavera.ru/29540515572al3f9.pdfIn PDF document text
    • http://helpcenter.business/josh_groban_granted_piano_sheet_musi65rp3.pdfIn PDF document text
    • http://kraftmann.su/english_language_course_in_urdu_100_days_free_download2qlof.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/Wxjigib/word_blocks_game.pdfIn PDF document text
    • http://trastqort.online/spherical_trigonometry_problems_with_solutions6vlh8.pdfIn PDF document text
    • http://everydays.space/matosakivu4v68.pdfIn PDF document text
    • http://shop-profildoors.ru/54600843058dlbur.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kosuvoz.epizy.com/art_gallery_management_system_project_report.pdfIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_f455fd818e25465f988d64d9e400e2af.pdf?index=trueIn PDF document text
    • http://sewesomepajava.epizy.com/julian_calendar_2020_quadax.pdfIn PDF document text
    • https://ba739632-11db-41f7-a023-683a20e55d36.filesusr.com/ugd/99835b_ffb7d08c8d1d43b385a96c9567bf57dd.pdf?index=trueIn PDF document text
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_6fa31e741c94469f9ebf631a41cb7a05.pdf?index=trueIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_1797fb43d09147b1a7cb66b1b6abc9ca.pdf?index=trueIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_83aae9c5cca04b9daf2b92f89e0cbfa8.pdf?index=trueIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_30b7cc510eb34d30afd96e724cfe26cc.pdf?index=trueIn PDF document text
    • http://kamabutexukawiv.rf.gd/bleacher_report_college_football_predictions_week_12.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011679.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11679 12424 bytes
SHA-256: 2b33aef2c55c3878cca502d5416f67bc0475a687c8c713d43f4b30c857834b73
font_00_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 5616 bytes
SHA-256: 7c8662aa3316fd3796f628205fbf15024b579f75af51f09f7d727033ac7da109
font_01_sfnt_off00010aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFF 3740 bytes
SHA-256: 6ce3ed3d0cf168fbf74d6eb321148d5efc31cda11559831b77020f7d4c9f4c8c
font_03_sfnt_off00013596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13596 42244 bytes
SHA-256: da776eca49a10ccf408987fb7d2c8cfe3038d5e1e4d8e107d40440175d72f074
font_04_sfnt_off00018723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18723 10816 bytes
SHA-256: 6ec51a00e8060efa23e9e076b590161c97c956f6bfb01ac73acd0df517fb0947
font_05_sfnt_off0001ac3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC3F 2832 bytes
SHA-256: 05c87e78233bfe3735a8669abf372c5f9fef928cb2ebf545cfc40ca3264d6618

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