Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff4aa3dd1ad5569…

MALICIOUS

PDF

99.8 KB Created: 2021-05-21 03:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8f5ac746cd37ad0cedcfa1fc11f3f57b SHA-1: 8301503ef6eea20057c731253a11a130c02a5691 SHA-256: cff4aa3dd1ad55695601dd388249419600ee5858e2eca6eeca077496c21857d1
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic PDF_SEO_LINK_FARM indicates a link farm on disposable hosting, suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URL 'https://jumiwimov.ru/strik?utm_term=how+to+mine+crypto+2021' and the link farm URL 'https://tumofevex.weebly.com/uploads/1/3/2/7/132710745/b0e563f.pdf' are the highest priority IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/strik?utm_term=how+to+mine+crypto+2021 PDF link annotation
    • https://tumofevex.weebly.com/uploads/1/3/2/7/132710745/b0e563f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_601b350dc63da.pdfIn PDF document text
    • https://xenafakawipa.weebly.com/uploads/1/3/4/8/134879239/b90a1fe1b779df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424331/normal_5fe229ec6eed0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402953/normal_5fdc7d1875f83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454420/normal_606548da9e7ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405186/normal_6030db5a2cd32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418166/normal_6019bab97233e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384028/normal_60323add18d9d.pdfIn PDF document text
    • https://pojalurerisufi.weebly.com/uploads/1/3/4/1/134109142/3807200.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486060/normal_6054c4054070d.pdfIn PDF document text
    • https://tadinitalu.weebly.com/uploads/1/3/4/7/134744808/5bea07d3340634.pdfIn PDF document text
    • https://fupevigojajoma.weebly.com/uploads/1/3/0/7/130738700/vunebof_xibuka_ravurojufed.pdfIn PDF document text
    • https://pafuzoxim.weebly.com/uploads/1/3/4/5/134585506/6f967fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/pabisoxopalipajexunufu.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/nesimutibojedofefozunoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e0cf5f2-dfc7-421d-a54c-19cf9ae6881b/how_does_the_book_misery_end.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ca593aa-76fe-4752-a90e-6ed6c6e121a9/what_is_expense_to_revenue_ratio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2c66326-7b6e-45a8-b269-fc674995376b/remevebugu.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/66489602549.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/663e6e6d-f237-4fdd-ac98-06a26229f1a0/verinowesob.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/ada_diabetes_diagnosis_guidelines_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/bohemian_rhapsody_piano_accompaniment_sheet_music.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DB 6568 bytes
SHA-256: 2ba6e0c4516ae528974428ab90d2fcb845e31fc6427c3681d976df34e50bf0fe
font_01_sfnt_off00012628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12628 5140 bytes
SHA-256: f71755fcd53e5a9e80da552ecf4a306193c170a873bb5d9529d2db123086e6fa
font_02_sfnt_off000137aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AA 3392 bytes
SHA-256: 67694ba3c31d08c58165952cce398612c36a0b67aa5411968a77468702d5f004
font_03_sfnt_off0001458c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458C 11292 bytes
SHA-256: eb9c2e1adfd8b821943afeb4668637dc23af9c57cd694c29f0607d8d2dd8b887
font_04_sfnt_off00016be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BE3 16116 bytes
SHA-256: 3dae81b76154e7c62b3b0d30507344c78f02ee9172d09a03fe7a9af96af9e849

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