Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ef481c7f566c32…

MALICIOUS

PDF

88.4 KB Created: 2021-03-20 10:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32689b88db5b2676a0abc7dcd480821d SHA-1: d80cc76d9836f8fd9c75c934cc04c0b97577d95d SHA-256: 87ef481c7f566c32ff895ca3576b4ce1cfae225746213176933b2eff97e4ad8e
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. No scripts were extracted, but the PDF structure itself is used to host numerous URLs.

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://jumiwimov.ru/wix?keyword=metabolism+revolution+pdf
    • http://bekopomulasebi.getenjoyment.net/internal_audit_manager_salary_australia.pdf
    • http://zazodasowe.22web.org/reduction_of_quadratic_form_to_canonical_form.pdf
    • http://rasezatoxefu.mygamesonline.org/66978654694.pdf
    • http://jenogoz.22web.org/42106679394.pdf
    • http://rubolanir.mypressonline.com/zarimefopazomokuwalopila.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_22687f06816d448e9c99a6e6d78dd274.pdf?index=true
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_23ea9a992f084c60a2ddd79738299f9e.pdf?index=true
    • https://c96d0889-97fb-4213-90a4-a08ae01970e6.filesusr.com/ugd/ed32f2_63f485e46778402c9e0bef56620e9aa5.pdf?index=true
    • http://nijopupeboxisa.epizy.com/29361483703.pdf
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_65c1361795434a7baae79e72f97013b5.pdf?index=true
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_43803bf8e21a4a579e95d9fd88ddc534.pdf?index=true
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_3cad803a77934063a5ea0988c95376ef.pdf?index=true
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_5783bced181749aa97f1447b49305a69.pdf?index=true
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_ad2bc9f3ad0e4e8396d1f09c6b4f4841.pdf?index=true
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_9b1e1f445a644ac5885fd1e9c7e2a31a.pdf?index=true
    • https://f9a132f0-acc9-4761-b7d8-38025aedd849.filesusr.com/ugd/5c71d6_dbad0a07c2ca4e9489d5a5ca5ba795bc.pdf?index=true
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_eb5c68335ddf418fbd9cf388701359e8.pdf?index=true
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_2fd8a1f7310b437faa467e9b312cb77e.pdf?index=true
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_ffbcb01706274babbae52680b7f350bc.pdf?index=true
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_93db373b41b24bff87b7cc7522b1b0e2.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010384.bin
20c1e932f209fc106b3e4a4c3abccfdbcd89c2645c0d2abd750a5166eb8537ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10384 5392 bytes
font_01_sfnt_off000115ce.bin
8e45de609fb2aea937ce83026bd0707bee56c4b0b24c3a7de0b708cfe0fb2861		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115CE 12212 bytes
font_02_sfnt_off00013f92.bin
2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F92 16060 bytes

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