Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b3878e9a0b8ddd…

MALICIOUS

PDF

73.1 KB Created: 2020-11-18 03:41:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad006f901913fdeb88be325dd0e17fe4 SHA-1: 5cc59d065c746b83283e8ee90b1cea5c7d2f6794 SHA-256: 49b3878e9a0b8ddd9a6d0d2b35f13d946a3f2bd99ac85000179a3a99c7cbf0c2
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack to redirect users to malicious sites.

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://trafffi.ru/123?utm_term=program+evaluation+proposal+sample
    • https://cdn-cms.f-static.net/uploads/4369520/normal_5f8f9b5d61ca9.pdf
    • https://fesitafixob.weebly.com/uploads/1/3/4/6/134653549/limititalejipi.pdf
    • https://palozemoxapido.weebly.com/uploads/1/3/4/3/134366311/9343450.pdf
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/8820ecd4fc.pdf
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/nedibezid.pdf
    • https://cdn-cms.f-static.net/uploads/4475847/normal_5fa78b0c82393.pdf
    • https://woxujinugav.weebly.com/uploads/1/3/4/3/134305359/5669125.pdf
    • https://cdn-cms.f-static.net/uploads/4446496/normal_5faa019b06238.pdf
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5f8818d2a3207.pdf
    • https://lifufamaz.weebly.com/uploads/1/3/4/6/134685481/5321dfc9e45c61.pdf
    • https://vepovipozo.weebly.com/uploads/1/3/4/4/134472033/kabeda_kizabixolow_rujinulomiv.pdf
    • https://cdn-cms.f-static.net/uploads/4393763/normal_5f9cc5be5d72e.pdf
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8925184.pdf
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/milowotuni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bidivo/gitudawuji.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d738.bin
7a526b5acdbc5b438b43287dffc8f549d32f50df7ede52d0cee2a1a3353c54df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD738 5080 bytes
font_01_sfnt_off0000e864.bin
10ed44491fc6c2d80c35855197170a2eb058857530be24a8206c7116b72b3b57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 9632 bytes
font_02_sfnt_off0001092c.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1092C 4324 bytes

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