Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b388437154e409…

MALICIOUS

PDF

78.8 KB Created: 2021-03-09 09:31:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b3fa2c44ec0d93497c7c6e2e3f7ad88 SHA-1: 5547ec73a622e09b04b0dc93e95a0ae359869725 SHA-256: 15b388437154e4098043f599fded8600786e113e5da209a045b1e081603e375c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated and point to other PDFs, indicating a link farm or SEO spamming operation. The primary URL, 'https://botokaw.ru/award?keyword=rem%25C3%25A9dio+para+c%25C3%25A1seos+amigdalianos+pdf', suggests a lure related to medical conditions to attract clicks. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/award?keyword=rem%25C3%25A9dio+para+c%25C3%25A1seos+amigdalianos+pdf
    • https://jomigivava.weebly.com/uploads/1/3/5/3/135330213/jovisujokizadagib.pdf
    • https://static.s123-cdn-static.com/uploads/4413345/normal_5ff68a5a2a300.pdf
    • https://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/2584565.pdf
    • https://cdn-cms.f-static.net/uploads/4478125/normal_603584f9bce4b.pdf
    • https://bagobizofenagex.weebly.com/uploads/1/3/4/7/134767931/saletopeterakawutaj.pdf
    • https://static.s123-cdn-static.com/uploads/4456999/normal_5fcf31c759c00.pdf
    • http://kvyovk.xyz/kali_linux_tools_for_windowskjwti.pdf
    • http://centerbluebadge.com/498784731638krcg.pdf
    • https://gojufepegaxop.weebly.com/uploads/1/3/4/3/134339744/d763d.pdf
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/jonuzi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dowadotiju/canon_eos_m50_manual_settings.pdf
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_f96b296a5f4b48cda52fdf975837918e.pdf?index=true
    • https://s3.amazonaws.com/muxozuvalubi/48363471535.pdf
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_4a09c1bf50614890be9e2922c7b293f7.pdf?index=true
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_05766291d03d47a0832314e17b1302b9.pdf?index=true
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_e76d9888489a48789a39be4f0eb79104.pdf?index=true
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_091f64035ea949ed9d3d6a6df31cc5c0.pdf?index=true
    • https://s3.amazonaws.com/zowibatev/touch_of_heaven_violin_sheet_music.pdf
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_2e499d7dd06d4348af4bb26628e93945.pdf?index=true
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_4c28d3d4eaaa4d77b99e9ebb805c35d0.pdf?index=true
    • https://s3.amazonaws.com/vinivuxo/95027875778.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_off0000f28b.bin
e01dc53f0af4412735813704846a23a28c23dcbd4b952b8cd3583d33a460dc36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 5860 bytes
font_01_sfnt_off0001058a.bin
d3be3d0995ac6070596818ea38f10bafabf7269a31e950e62fbaea3fb8c40799		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1058A 12796 bytes

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