Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb7e6880fbc454d…

MALICIOUS

PDF

78.8 KB Created: 2021-03-27 16:08:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 270f4e84d23d5d36e2da30f84fb61082 SHA-1: 9265335735119c347c0ed5eb472fb9d7c6cc65c7 SHA-256: 1eb7e6880fbc454d3061a69e8f8c2d98630b466175801c710c4a147df1ef1e06
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 pointing to Weebly-hosted PDFs, which is characteristic of SEO link farm abuse. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to malicious sites.

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-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://ponafet.ru/wix?keyword=tri+state+runners
    • https://tafubevodila.weebly.com/uploads/1/3/4/0/134016741/wadevanimo-vumoribol-zemusum-pesusomagevezef.pdf
    • https://cdn-cms.f-static.net/uploads/4418379/normal_60391686e1926.pdf
    • https://vefibaxo.weebly.com/uploads/1/3/1/3/131379874/2bb8f431faa.pdf
    • https://puxibaso.weebly.com/uploads/1/3/0/9/130968956/3316204.pdf
    • https://cdn.sqhk.co/sadirorig/SibxiiV/niluvo.pdf
    • https://cdn-cms.f-static.net/uploads/4381976/normal_6041ebf186a06.pdf
    • https://cdn-cms.f-static.net/uploads/4422658/normal_6016034187e7c.pdf
    • https://cdn.sqhk.co/tabotewo/WYjhYap/fojore.pdf
    • https://cdn.sqhk.co/dojopaxitovi/ighdig6/kodiak_cakes_muffins_review.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bulolimepol/59333392796.pdf
    • https://4a5bfc55-71df-4474-8f3e-9f6aca65c64b.filesusr.com/ugd/29b6ce_26e2251209c1445b8c442bede268690e.pdf?index=true
    • https://s3.amazonaws.com/dekogamik/pifizomaxegegafeluxumu.pdf
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_20516c416ca4414f8c87ac2880d5f89e.pdf?index=true
    • https://s3.amazonaws.com/tezude/summers_heat_pellet_stove_manual.pdf
    • https://s3.amazonaws.com/donake/gisikagatiwapejo.pdf
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_89d1b543a3b14da0b6e5f4de0d17a26e.pdf?index=true
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_df976d49d87a4a22bd932e11f36f019a.pdf?index=true
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_4a897bb72c874ef598efb6f7350046da.pdf?index=true
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_3ef51bf8b7854f2aa35af7811181fb9a.pdf?index=true
    • https://s3.amazonaws.com/difigomisosak/adobe_captivate_2019.pdf
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_923b9b18912d48399e351f205e7a5a11.pdf?index=true
    • 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_off0000f436.bin
cc604b71fd8aba0aea616a7339f8d014a6ca0471e11d5901e6c19dce78af26cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 4596 bytes
font_01_sfnt_off000103e0.bin
2db39a010a66b15e30b9f98c3f9a29337d31dac2a83ccf03643dc2070b2ba448		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 12128 bytes

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