Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1d619ff546cd28…

MALICIOUS

PDF

75.0 KB Created: 2021-01-16 14:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f4db599584cb2bd926d5584df2f0cfb1 SHA-1: 7273b41044c310dee167ebe4fe12a29907adff63 SHA-256: fe1d619ff546cd2832ae6e371ebb0d323f0e7ad08f00090b3591542fc30f90b7
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to Excel functionality, likely intended to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://gettraff.ru/aws?utm_term=can+i+copy+multiple+sheets+in+excel In PDF document text
    • https://site-1182082.mozfiles.com/files/1182082/27531094592.pdfIn PDF document text
    • https://site-1167954.mozfiles.com/files/1167954/witcher_2_crafting_runes.pdfIn PDF document text
    • https://lifalaril.weebly.com/uploads/1/3/4/8/134883644/modilojil.pdfIn PDF document text
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/weliv-besakubugi-jakirotudajate-puvevowinemubix.pdfIn PDF document text
    • https://site-1174796.mozfiles.com/files/1174796/high_volume_instrumental_ringtones_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopijaku/jhgeIhd/best_3_point_shooters_all_time_2k19.pdfIn PDF document text
    • https://xarirutufe.weebly.com/uploads/1/3/4/6/134659575/sinosususos.pdfIn PDF document text
    • https://kuxiwidozerapi.weebly.com/uploads/1/3/4/7/134728536/dbbb3032db5472.pdfIn PDF document text
    • https://site-1171806.mozfiles.com/files/1171806/blood_pressure_monitor_apple_health.pdfIn PDF document text
    • https://cdn.sqhk.co/nomazotesi/UQjhicE/vemukabulapudew.pdfIn PDF document text
    • https://site-1202889.mozfiles.com/files/1202889/71045741653.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/mesotodimus/factoring_polynomials_worksheets_algebra_2.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/bus_racing_games_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/congenital_heart_disease_guidelines_2018.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_off0000e8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 5152 bytes
SHA-256: 138c85414a5b3fc977e8877e5b73446c0e41cee0b8f448d2b7a8181567281075
font_01_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 11032 bytes
SHA-256: 739e18d683d3305cacf2e42ca38fdcd3c5b48c51a89b83447dff79193025afc4

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