Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff20243b02c390d…

MALICIOUS

PDF

67.8 KB Created: 2021-06-01 14:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d9f7c8ac49bdc45694a39bfd9a2f9fe5 SHA-1: 015b0cfa255d11d92d55a7cb3fc3f941dec8f585 SHA-256: 2ff20243b02c390dae03f3b1e83c823431aa989b7a2f34817e08b7ae91d903aa
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, indicating it was likely generated programmatically to appear as a worksheet, a common lure for phishing attacks.

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
  • 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://huntic.ru/pbw?utm_term=happy+new+year+esl+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411250/normal_60231920ae309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_5fdbe8105cd31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454681/normal_5fdf9b6aea065.pdfIn PDF document text
    • https://gewaxuselez.weebly.com/uploads/1/3/4/2/134265722/1351206.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470677/normal_5fee7110849d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_60118fc0b3941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_60550f60bca22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_602f0c5455a0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494866/normal_5fdb52a1781cc.pdfIn PDF document text
    • https://juxufosuzuvol.weebly.com/uploads/1/3/1/4/131437906/4021254.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nusuwoxub.pbworks.com/f/principios_de_anatoma_y_fisiologa_tortora_13_edicin.pdfIn PDF document text
    • http://bilabegape.pbworks.com/w/file/fetch/144442665/95314551503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4cd08d4-b759-48a0-9b01-cf5f3f24a8ee/asus_rt-n12_d1_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18830aac-6e2c-47d2-80e1-6ab5f50c5eaf/hoja_de_vida_minerva_1000_descargar_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5bd465d-862a-4088-9528-9ce3aea85aa0/60231643472.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/how_to_reset_tzumi_sound_mates_no_buttons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fdf4ea8-f0fb-4c0d-ae9e-9580303533f4/how_to_use_reverse_psychology_on_an_ex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64595073-888b-4c3a-afa2-a52c67c5de23/5597016006.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_off0000ce04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE04 5124 bytes
SHA-256: 628b98785bb1d31bbeac82e8c02d16b7e5c999e6e8eb9e3c5c17ed46d44ede20
font_01_sfnt_off0000df7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7C 10280 bytes
SHA-256: ee73019889aa99e759ed9f8e0f13fb22e0049fec31d2ac9b5afce9c0f5284b59

Open this report in the interactive analyzer, or submit your own file for analysis.