Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf071113b87c054…

MALICIOUS

PDF

113.2 KB Created: 2021-03-24 04:38:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fa0362543ef58c4b94f9d9999f46c50 SHA-1: 2296dead83a4c70a3106a608ffcee94505c67b4a SHA-256: bcf071113b87c0541f6b6cb35c9c114423bbc8a1b3922ba4344cadeb0f971247
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9861

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/aws?utm_term=who+has+the+best+prices+on+pellet+grills
    • http://lafowesezojo.scienceontheweb.net/the_secret_to_attracting_money.pdf
    • https://static.s123-cdn-static.com/uploads/4483610/normal_600020a2d48c9.pdf
    • http://moresukko.ru/948922197393gs9k.pdf
    • http://zokidinodajives.getenjoyment.net/fusionner_en_un.pdf
    • http://nulivanofika.mygamesonline.org/atoms_and_molecules_ncert.pdf
    • http://eurofamily.pro/painting_ideas_for_8_year_oldsr8e1l.pdf
    • http://antinomi.design/interior_designer_jobs_houston_txvgmvd.pdf
    • https://cdn-cms.f-static.net/uploads/4485826/normal_605a8d332747e.pdf
    • https://cdn-cms.f-static.net/uploads/4377120/normal_601601772ceae.pdf
    • http://cookwellbakewell.com/star_wars_the_rise_of_skywalker_visual_dictionary_downloadscpmt.pdf
    • https://cdn-cms.f-static.net/uploads/4445869/normal_603c1bbb8f561.pdf
    • https://cdn-cms.f-static.net/uploads/4369524/normal_6046c3eb8c410.pdf
    • http://hushseo.online/lupagajipfvw1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f2f87468-bb50-45e4-9a16-d60d3fa5c787/raguk.pdf
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_697df2964a674f8882cb97b9648ec947.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5aca86d6-ec88-4466-9c11-2e3be24adb31/tigibafal.pdf
    • https://uploads.strikinglycdn.com/files/e16b70d1-36b6-4b02-be99-871f36411378/nepixaxoxememivivitaxeko.pdf
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_1d69910f22ca40708ae4ceaa6dac52ad.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0db467be-1c81-4993-b49c-9c5a3adf07ed/kindergarten_math_practice_book.pdf
    • https://uploads.strikinglycdn.com/files/ad9271c7-198d-4b87-aaf3-ca285378f7d1/digital_communications_and_multimedia_degrees.pdf
    • http://sisufovofow.atwebpages.com/47413794887.pdf
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_5bfc3b0efbd24295a9943dd0e3f7599c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/865d2bdc-69fe-4b48-b1a3-0820a902d93a/al_quran_app_for_android.pdf
    • https://uploads.strikinglycdn.com/files/40fd7e26-0a22-43e1-b20b-bf60ada2fc98/how_to_shift_eaton_fuller_9_speed.pdf
    • https://uploads.strikinglycdn.com/files/8e27ef6d-c479-440e-a8d9-3839e27efd66/repajozuvuwitusisega.pdf
    • https://uploads.strikinglycdn.com/files/246c7079-d419-49b1-93c9-ae0f6b1231c6/wexorar.pdf
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_3a134a0a3acc44fd979342a1f478e7b3.pdf?index=true
    • http://fufudaloxola.onlinewebshop.net/carnage_meaning_in_tamil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017026.bin
6725bcf6da9a747963a97714642453a322dc021d90dca26ba8a5d7a1b4eb2f1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17026 5348 bytes
font_01_sfnt_off00018253.bin
071c34648cdce17f73f267ff58c6989cf23350762f36a618ca436088068297f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18253 2468 bytes
font_02_sfnt_off00018d83.bin
2e1244d60dc9f608f7d634ae3d1d4d430e0416360b7bb2e92f769b94fad0e314		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18D83 11932 bytes

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