Malicious PDF — malware analysis report

Static analysis result for SHA-256 5252f8ffff9f615d…

MALICIOUS

PDF

81.6 KB Created: 2021-05-28 09:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ad69ae8d5ca36caa8b2b9b7e757e07a1 SHA-1: 7fea69f0ca3640719d436c14ccbffbe571e91390 SHA-256: 5252f8ffff9f615d481647b2f8b8f83cdb0c9b9457738bc0939c11cfe0c4fe5f
196 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 SEO-optimized PDFs, suggesting a link farm or phishing lure. The presence of a redirector URL and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'Jethro Tull flute solo sheet music' to entice downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/strik?utm_term=jethro+tull+flute+solo+sheet+music PDF link annotation
    • https://xameramavojipav.weebly.com/uploads/1/3/4/2/134265998/bolef.pdfIn PDF document text
    • https://bagukewedofitaf.weebly.com/uploads/1/3/4/5/134507185/buzelov-pisuzu-worogonuta-tavasomo.pdfIn PDF document text
    • https://xeluluferira.weebly.com/uploads/1/3/4/2/134266649/27575.pdfIn PDF document text
    • https://vimavopama.weebly.com/uploads/1/3/4/7/134769365/605318c24e3c1.pdfIn PDF document text
    • https://suwanozafedo.weebly.com/uploads/1/3/4/5/134587456/a1ab7326.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/126969ae-2ede-437a-aa11-ff20c0867730/diwowosiram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7d6ae02-bf09-451e-a529-86321f0bda76/zuwoligilapabaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de5225cd-1c06-4c21-a7b6-a477ff55c115/kakunujen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a65e6dc1-0fc8-4219-8997-4eb82890f6d0/42943613031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/176e915b-acca-45c4-85ef-7bf6afbcc5ea/26729200966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7b886d2-9458-479e-9b53-ac6d0cf1e35e/cfmeu_qld_pay_rates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fc78b5c-2369-4ded-b9be-1e25d074656b/navy_seals_training_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/775e8df0-a8f0-4b31-865b-5a0319516339/54799010901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/732be913-0f32-4968-80c2-209c96ffefaf/arabic_grammar_rules_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd871ca-a04e-4ca6-8183-fe520a7748f8/totowexiromovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74cf27a9-10f7-4f3e-a6e3-c0734e8048e1/quistes_blastocystis_hominis_es_contagioso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20752203-7cce-46a3-b1e9-a074c0198773/13821695130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f295401-8e10-4d4b-9ed8-cc4d79604626/the_debt_collector_2_full_movie_download_in_hindi_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01687782-c9c7-4841-b56d-bf7889c12aef/vegivubemap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b14cf511-8f7a-45cb-a7f9-5fc019faaa3f/how_to_hard_reset_a_kenmore_microwave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00008962-95a4-499c-81a4-e8176f76a4cb/digi_002_firewire_cable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9de549ab-b0a2-4684-9723-8f56a773f545/lodysse_dhomre_6me.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53F 4900 bytes
SHA-256: 26f269002a2f55e3fffe8eab5fe71213c1ff0da1cf3c705f552ccf64ad3ef41b
font_01_sfnt_off0000f5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 11844 bytes
SHA-256: 55ea23cc4d67a422342dd9cde087335c2461cc854cdf2ec790b1f553b17e1bee
font_02_sfnt_off00011bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 17840 bytes
SHA-256: 970e67d0e01229999f2c1b9639a93114443deeb5d4da3d9dbbfa4d5f5106651b