Malicious PDF — malware analysis report

Static analysis result for SHA-256 75660cf023bc2470…

MALICIOUS

PDF

74.7 KB Created: 2021-04-07 19:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ff013695d10b636dad1beb527aea12fa SHA-1: 8427b69a1c598eeb5a96c69fdd653f7f2be38226 SHA-256: 75660cf023bc2470de1b43b90ebcf6d9f0a8e1255e92465fbcdf5132105aba3c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=why+is+my+amazon+remote+not+working PDF link annotation
    • http://gubuxuk.scienceontheweb.net/piwedukife.pdfIn PDF document text
    • http://goldstein.capital/89314060253r42tx.pdfIn PDF document text
    • http://lastmarkt.ru/angular_4_file_from_urlr7k6u.pdfIn PDF document text
    • http://websporizle3.com/59265534527duk4a.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/njdot_pay_item_catalog.pdfIn PDF document text
    • http://7lessons.site/android_tv_best_movie_appsldnb4.pdfIn PDF document text
    • http://inostrana.com/72636849585xxxaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4b3c1411-62fe-4b74-ac0d-dad8ff5dd90a.filesusr.com/ugd/d10829_1528403550be4385bf2080d04dc524c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovilowab/manual_chapati_press_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5078a37-5cd0-4d89-802a-bc4e425c4c8c/the_oedipus_plays_of_sophocles_shmoop.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/3688118363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55788c69-1c31-4f94-a119-5d983bda8206/lengths_of_intersecting_chords_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/personal_financial_statement.pdfIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_c2f0462a89744bb5b374be7f2db30c6c.pdf?index=trueIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_fa7cb91976954460942ecc31e3ef80ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/46238622113.pdfIn PDF document text
    • http://gitodake.myartsonline.com/statistics_short_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/zexanosagemumiba.pdfIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_ba0841c2fb6f4337900b298a8d0d5794.pdf?index=trueIn PDF document text
    • http://nejesezape.myartsonline.com/unix_shell_scripting_programs_tutorial.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_off0000e578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE578 5388 bytes
SHA-256: b6849dd8b3540fe6e43d9cb76a6839bfd232f2e0504a9f28bc96d285200e3632
font_01_sfnt_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 11200 bytes
SHA-256: cc61bf849bde6d4ff61bb7a338ad5db195193391c393546aeda512fe618a3b9d

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