Malicious PDF — malware analysis report

Static analysis result for SHA-256 51eaabc71a43bcdd…

MALICIOUS

PDF

88.6 KB Created: 2021-06-02 00:39:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89d7341ffe6eb8006e13e46dc7b57103 SHA-1: 90b78f3e396052f0677fadd2756114401fe75a03 SHA-256: 51eaabc71a43bcdd986fd70c351e924bcc445fd36c7cfb19c28936fbd9452b35
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF documents, suggesting a link farm or content-spinning operation. One prominent URL, 'https://inwebjor.ru/pbw?utm_term=how+much+is+a+whole+yellowfin+tuna+worth', is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/pbw?utm_term=how+much+is+a+whole+yellowfin+tuna+worth
    • https://cdn-cms.f-static.net/uploads/4446285/normal_600b60cb12d4a.pdf
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/6836502.pdf
    • https://bajerezera.weebly.com/uploads/1/3/4/0/134016740/7722695.pdf
    • https://powipasime.weebly.com/uploads/1/3/4/7/134725879/kekesujalaredoxe.pdf
    • https://static.s123-cdn-static.com/uploads/4428033/normal_5ff0ce0fb1d1d.pdf
    • https://konegodifoxud.weebly.com/uploads/1/3/1/3/131380175/mopera.pdf
    • https://pukokisawar.weebly.com/uploads/1/3/4/7/134749025/9cbf0fe.pdf
    • https://nivavige.weebly.com/uploads/1/3/0/7/130739715/5736166.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1d5534fc-51b2-4c6f-9a46-c70afa077bdf/learn_italian_book.pdf
    • https://uploads.strikinglycdn.com/files/2fd3b162-fca4-4f0d-9d46-0e612af59f93/how_to_trade_forex_with_thinkorswim.pdf
    • https://uploads.strikinglycdn.com/files/d6e38cf2-e206-4775-b050-99265456a763/how_to_reset_my_logitech_mouse.pdf
    • https://uploads.strikinglycdn.com/files/36e238ce-2a59-4420-819c-4ac6f2822617/goluliduxatabimaruragax.pdf
    • https://uploads.strikinglycdn.com/files/68f5744a-bd41-4397-b3a0-3f059dbb99b5/lotirulofexiteb.pdf
    • https://uploads.strikinglycdn.com/files/25ec3c63-3a78-4803-9e15-921a1d24417b/wapolotixusanize.pdf
    • https://uploads.strikinglycdn.com/files/28099552-3a43-4df6-97f6-9435afc42205/rt_ac68u_specs.pdf
    • https://uploads.strikinglycdn.com/files/94722a5d-630e-4f96-9f6f-d5d4dd6092f7/87227937740.pdf
    • https://uploads.strikinglycdn.com/files/d3284309-e2c3-491b-9c55-74dbd0f26edd/momefepesov.pdf
    • https://uploads.strikinglycdn.com/files/677bed53-d019-49c5-b037-53060bd6d6f4/69821176677.pdf
    • https://uploads.strikinglycdn.com/files/f4350608-c20e-408d-9af0-b5635faa550c/how_dense_is_water_in_g_cm3.pdf
    • https://uploads.strikinglycdn.com/files/afcd826c-d7c4-4b94-b4d5-a176176e8867/movowa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ed2.bin
9b1d99840b3c89300f2f55e973719b6a3c12009dd58a602b091674bb1465e50a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED2 5276 bytes
font_01_sfnt_off000130b4.bin
e557c36b7f44e1b10ae835f666b6933773e6095c7980d83e28a4d1ad3b1ff948		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130B4 10688 bytes

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