Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dff701f229118cf…

MALICIOUS

PDF

98.0 KB Created: 2021-03-25 09:02:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8c2e53c6796b79d27297a9860a131c65 SHA-1: bd0b98df748bb30dee87021f5dd2cdb251c11c0e SHA-256: 3dff701f229118cfe1c77328b6869e08ee098028f4496a2b6830792e12365a2b
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=ordered+pairs+pdf In PDF document text
    • https://begaraga.weebly.com/uploads/1/3/4/6/134652864/lomewaxuje-latuwakul-gogivulinamidud.pdfIn PDF document text
    • http://luminar4-download.xyz/screen_recorder_with_video_recorderudcnn.pdfIn PDF document text
    • https://vataripisak.weebly.com/uploads/1/3/4/6/134600115/xevitodixozizusum.pdfIn PDF document text
    • https://cdn.sqhk.co/dadirowuj/ggSifol/fonufosobumawew.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/icM6Zif/36614644358.pdfIn PDF document text
    • http://help-bluebadgecenter.com/muporupefediwamirusekspckk.pdfIn PDF document text
    • https://butadagawonor.weebly.com/uploads/1/3/1/0/131070306/5204922.pdfIn PDF document text
    • http://laregazobo.22web.org/subtractive_bilingualism.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gaderadosunuse.rf.gd/29229991585.pdfIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_30c960007138462ba5171de4134976f7.pdf?index=trueIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_84d6af3607f04ce98c1339f7144389f9.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_0f00b28dff5941a7bd29b4403ab88db7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/clsi_guidelines_for_edta_tube_stability.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/gunsmith_part_1_guide.pdfIn PDF document text
    • http://xiwularofevomu.epizy.com/netherland_dwarf_rabbit_pet_guide.pdfIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_07547bc454f0475b8def1b14dda078f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/nalipuwudanejixabagi.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/58613616625.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_off000123cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CB 5032 bytes
SHA-256: 5c83d3c28662f13b8289b78288e3bc952518ed2c4d5739b0b92f283f449deb48
font_01_sfnt_off000134f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F4 13064 bytes
SHA-256: 89c9b34e3bfdc833ac5d49020f842832e5dfaa027e2c144ef768b63ed5613e9f
font_02_sfnt_off00016142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16142 17164 bytes
SHA-256: 008f64e1695b001080a1c8b9d0671d320a9967f3ae02b269bade43ae4460e641