Malicious PDF — malware analysis report

Static analysis result for SHA-256 533d7aff85ef99ca…

MALICIOUS

PDF

91.8 KB Created: 2021-05-13 18:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 533069f4da4107ab36d9ba236609f606 SHA-1: 025b6b6adeaafe6eb48823385eafca0be9beb324 SHA-256: 533d7aff85ef99cac91ab576a9b7e782beb16b6e6118e2e27d2e4990334abe0f
186 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 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 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://seumenha.ru/strik?utm_term=how+to+use+a+quote+for+a+topic+sentence+dbq PDF link annotation
    • http://zegererevez.medianewsonline.com/rigosamowidogeti.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/38842423222.pdfIn PDF document text
    • http://bodulotol.22web.org/lo_que_no_te_mata_te_hace_mas_fuerte_libro.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/how_do_you_clean_a_hoover_steam_vac_spin_scrub.pdfIn PDF document text
    • http://dorutote.scienceontheweb.net/bsc_sem_1_maths_book_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6487971d-d8c9-4207-aeea-80f6850b56cc/manga_drawing_software_for_mac_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/putasidewos.pdfIn PDF document text
    • http://zinizar.rf.gd/murmurs_of_earth_the_voyager_interstellar_record.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70c60f5b-be98-4dd1-8998-75001dc8b887/57690757914.pdfIn PDF document text
    • http://nowimirozox.atwebpages.com/xefan.pdfIn PDF document text
    • https://6d0c6d30-55b9-4b7f-8145-34d11b484ddf.filesusr.com/ugd/8db56d_c94e4136e192497087e6b70497b5c2a9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/056ad4a7-7920-4c8b-b8d2-4458551800be/vuwuxi.pdfIn PDF document text
    • https://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_608bdae60fa74a5b88bfe194209607bd.pdf?index=trueIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_c0765a75a0e1446bb035f6c20dee7672.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf742d4c-5e85-46bc-b815-9aa39f193e8f/36036484059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dabadea-50cf-428b-932c-3270f65fdb0e/19467269287.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/24539321032.pdfIn PDF document text
    • http://sijukote.rf.gd/the_heiress_full_movie_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61f0d6bf-e918-48bb-a8bd-2d3ec6cef6e0/99972666834.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0C 5436 bytes
SHA-256: 90944a26844e7623fdce169cb6457686d68f5d2370b4e42f395332113d533e3d
font_01_sfnt_off00012f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9A 2468 bytes
SHA-256: 8a38bbd03f1a8860df3204ecd0d26f1517b82cf30342672be2e9b914a1a38883
font_02_sfnt_off00013a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A38 11328 bytes
SHA-256: beb6a00a2493c1159267f370331d305437c221acbdae97bc724b4453678f1b61

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