Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf99121ba8661689…

MALICIOUS

PDF

80.8 KB Created: 2020-12-27 09:07:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ccec07a59b689dad3291e5fdbc7851a4 SHA-1: bc1faf054cbcd64ebda0153b0bc6ed0bcc4333c9 SHA-256: cf99121ba86616897ee756ed9df4e39d83614b97ada45e57d62ab69b213279d6
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including those on disposable hosting and link farms, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a deceptive title, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffi.ru/strik?utm_term=some+cake+decorations+crossword+clue PDF link annotation
    • https://vakasuvarepem.weebly.com/uploads/1/3/4/3/134328097/fc975268120abf6.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/rezasokeri_vilatutamonobar_dogosurikenime.pdfIn PDF document text
    • https://voxonevixes.weebly.com/uploads/1/3/4/3/134383310/tezezufamatuxur_daxitalo_nesur.pdfIn PDF document text
    • https://vabiganivasekeb.weebly.com/uploads/1/3/4/3/134339064/lejexemuziredig-jixana-dokekiba.pdfIn PDF document text
    • https://temoxemotedi.weebly.com/uploads/1/3/4/5/134599163/da4b3193cc82d7.pdfIn PDF document text
    • https://wosumugip.weebly.com/uploads/1/3/4/8/134867897/7796495.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373301/normal_5f99c9c710825.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/xukonakefules/44416164550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a469ebb0-2a69-44cc-8bac-3edd847a7339/watazofirumufemenevujibi.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/aakasha_ganga_malayalam_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d00e6432-dc8e-47db-91b5-e67617cf0f3f/63044952661.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 2856 bytes
SHA-256: 717092d5dd59c8c49ea36c83d21618a51de6d98202d26afd0df3526fbfe5f645
font_01_sfnt_off0000eb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 5344 bytes
SHA-256: 9cf5772b778fa8ba1da3c815f06736144fa4273b1af3364f431f4288dc790058
font_02_sfnt_off0000fd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 1984 bytes
SHA-256: b510c529800d5d440e7be8423cfc673bc2d8ccc75e8eef988a02e6f344cfbe40
font_03_sfnt_off000106c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 13156 bytes
SHA-256: 0db17d3424d57355faeff619c1e4e369b6baad48f5de5e75cea7aa05c034492a

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