Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa92f9b6e683ba61…

MALICIOUS

PDF

77.0 KB Created: 2021-03-17 01:36:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44e4e49cc18a03ded60c3ba55312885b SHA-1: d0ba2160edd3b30b047b447a7cca8928b22cf3c1 SHA-256: aa92f9b6e683ba6196abcca28b73a444e6dfbdec10ae32c6423595799940153a
134 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/wix?keyword=drastic+free+apk+no+root
    • http://lumogodasekepi.mypressonline.com/how_to_make_baby_cuddle_blanket.pdf
    • http://zuvatewovu.scienceontheweb.net/qualified_audit_report_2020_19.pdf
    • http://giftcard-sale.store/excel_spreadsheet_tutorial_youtubeu48xd.pdf
    • https://vilejote.weebly.com/uploads/1/3/4/6/134629871/f6af7cfc0bd5122.pdf
    • http://tuwasukam.getenjoyment.net/gepijowowedebefiger.pdf
    • http://marinarus.space/perry_s_chemical_engineering_handbook_9th_editionrmrlg.pdf
    • http://pro-gram.pro/95148495867y8gyo.pdf
    • http://wudazex.sportsontheweb.net/5482670534.pdf
    • http://sallehq.xyz/773184872949ap8u.pdf
    • http://ludirobus.getenjoyment.net/12734305019.pdf
    • http://lelekelosutov.getenjoyment.net/where_do_chicks_come_from_book.pdf
    • http://canonsburglake.org/ripesogeloponun8427d.pdf
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/zusokixitopo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/62f55ef9-f7b7-440e-9a96-5ceb1b52360a/42498240020.pdf
    • http://paguxesij.myartsonline.com/1000_books_to_read_before_you_die_list.pdf
    • https://uploads.strikinglycdn.com/files/f7096d5e-e3dd-4407-81bb-8a70114d60ea/2017_lexus_gs_350_f_sport_interior.pdf
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_407f57c47cb6438ab6ce615122802619.pdf?index=true
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_5136ee4ad5b9444b837d0e28be2d4542.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4eb95f33-76a0-4eea-b8f2-3f6e49523e4b/how_to_pair_spectrum_remote_to_cable_box.pdf
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_5e095ba1ed48430b94171cf076078ffd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/595caa29-7909-4b53-bed6-19058b35ebb4/kitchenaid_superba_ice_maker_red_light_flashing_twice.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_off0000ef1c.bin
82bafb7eaa8e6be61379b1cf2af266eb0e6c8dac1f72760314f2afa9bc2397e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 5040 bytes
font_01_sfnt_off0001005d.bin
0703e80dd1a876f9cf850f25b9dbf159c9cbdd4b8b3a4ba3b0a39f7be19e7732		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 11288 bytes

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