Malicious PDF — malware analysis report

Static analysis result for SHA-256 437e80171b28c150…

MALICIOUS

PDF

76.0 KB Created: 2021-03-09 18:07:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ab622e736bb993c691fd0fccf8dbe535 SHA-1: d9ccc8d9a97a492347bdeb896431376b77d10a92 SHA-256: 437e80171b28c150a0af437c6ae0d9688e4ba9b9d107001abae2b80af7f5cbd1
226 Risk Score

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. It uses a password-protected-archive lure. 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 0.9991

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ponafet.ru/wix?keyword=getting+to+know+the+periodic+table+worksheet PDF link annotation
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/dewutexoropozi.pdfIn PDF document text
    • https://xukifunizagopo.weebly.com/uploads/1/3/4/0/134013279/b7e73c514efe96.pdfIn PDF document text
    • https://somusepuxe.weebly.com/uploads/1/3/1/0/131070447/2192712.pdfIn PDF document text
    • https://roregujezapa.weebly.com/uploads/1/3/4/4/134470200/balobijo_mevexorisun_mefol_dumuvazinelifan.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/mojigadetutavubuguwavuv.pdfIn PDF document text
    • http://xalowazejadiv.getenjoyment.net/53860198213.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_9787d1348c41445ea07a9be336aae17e.pdf?index=trueIn PDF document text
    • http://rijemow.onlinewebshop.net/raymarine_c80_firmware_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/859d02be-869d-4c8d-8d55-239e1bae6c54/29069576967.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/jatubodugekufunewofaku.pdfIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_18bf0350ac084c4d94457015c04d515d.pdf?index=trueIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_20238312002047b0b495e43e8e8184d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/teri_meri_kahaani_wapking_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ba7f601-e668-4a16-bbe2-c7ad7ac17810/t_maxx_2.5_transmission_wont_shift.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/174ef44c-5318-419c-a24b-f50dbb94d1b2/mozotewusake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f7678bb-02af-46bd-a1f0-a389fb0c0783/93084509148.pdfIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_498512609bf441679871c1c07fa455b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6970a4b-4102-4951-aa9e-5a713d981f68/tokyo_ghoul_season_3_does_kaneki_come_back.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5381f1de-f601-41ab-979f-104788068ff2/bengali_to_english_dictionary_free_download.pdfIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_fe9d9315e3114a2d825959c1bd4d71e3.pdf?index=trueIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/sejakaj.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/23647982419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93436c37-99b6-4ef5-8f72-66eaf7b6f23e/figurative_language_examples_in_songs.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/92875366376.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_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 5664 bytes
SHA-256: 9c3facd864788e26d95fcb676306751042a3b81df53e1bdc78cc9bbff1daa2c1
font_01_sfnt_off0000ff1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1A 10284 bytes
SHA-256: 33d1f6526463456286842341db32ab67120c70fd362045c56fd1423a576ab327