Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89557672ebf9cad…

MALICIOUS

PDF

89.1 KB Created: 2021-03-30 08:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e621c14b7ef179a4d6921d7e18c56dec SHA-1: c4e2dea5daa172485674f56767be000b72b79f3a SHA-256: d89557672ebf9caddd1ad0e361c08a8e775ada39a0d378cff02560ea83a56b2a
206 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a malicious link farm, with numerous external URLs embedded within its structure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of malformed streams and a large number of external links suggest an attempt to obscure the true malicious payload or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://fokemale.ru/123?utm_term=lagu+batak+modern PDF link annotation
    • https://nenubijul.weebly.com/uploads/1/3/5/3/135393623/4368685.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/fWhaBjj/favave.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/1rjhf59/46396765860.pdfIn PDF document text
    • https://tajuboramaze.weebly.com/uploads/1/3/4/5/134591815/fufij.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwasazafu/fjaE3he/3754287126.pdfIn PDF document text
    • https://cdn.sqhk.co/rotuzuwibi/tihvRgf/luxafunimovibi.pdfIn PDF document text
    • https://zoxusikajikad.weebly.com/uploads/1/3/4/8/134851315/xumuxizimelik_gifonoxipamesil_bedaralaxifex.pdfIn PDF document text
    • https://sotamepepoj.weebly.com/uploads/1/3/0/8/130874386/memipeka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_0cd57a225ef9451f95cccfe2a58d7456.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/least_square_regression_line_worksheet.pdfIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_9ff406f5966042eab7acb3a2230165e1.pdf?index=trueIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_d70f8022c4da4c3d9bd6f32208cadecb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pigolo/68798977812.pdfIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_0b6436ff3cf54daaad9dfb71bced4d15.pdf?index=trueIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_d84cd00f703046ecaa76042ba1ed0c91.pdf?index=trueIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_fd22c69775a0466d99782155463414a6.pdf?index=trueIn PDF document text
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_c23edf1d5c5d4c3280dec237a3628771.pdf?index=trueIn PDF document text
    • https://18d8f76e-0bdd-4b96-b744-fee987eed1b0.filesusr.com/ugd/1486c8_156433b89253483dbc449293108330da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/xinanepesoxamipavewe.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 5080 bytes
SHA-256: 39b66a605f0926a0d1f736240aa57a07321a851c397f02b1ec45cf4cdccc4687
font_01_sfnt_off00010847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10847 2460 bytes
SHA-256: 391faab0fd3c93e6118904eeefb8683b622a94c4affa1004b3f585f60e788701
font_02_sfnt_off000112f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F0 10860 bytes
SHA-256: 90ad7662350f22d4310018e77b0b8325202500ac29e792b19fac649850392029
font_03_sfnt_off00013884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13884 16680 bytes
SHA-256: 28afba3c71719cac8396a8a9bc089a886e3b4090a33f8e959805cfa1d34d3c8f
font_04_sfnt_off00014f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F15 1736 bytes
SHA-256: 74be5bc4d46f64e5c506ae1006f7022dc98ebf960e37c7bf417c2027ca73106d

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