Malicious PDF — malware analysis report

Static analysis result for SHA-256 47acf5396a68da6b…

MALICIOUS

PDF

83.7 KB Created: 2021-03-17 20:43:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab3f6e8d6cff187e2d735b4c3ead5566 SHA-1: 59f1b281129e6fe196332018adadd087d0ab19d2 SHA-256: 47acf5396a68da6b93aa10ca8cd1f45c627221609b70bc62f4ecfa9afb5c0939
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_LINK_FARM heuristic specifically flags this behavior, indicating the document is designed to drive traffic to other sites, likely for phishing or malware distribution.

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-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://nipisod.ru/aws?utm_term=simple+comfort+thermostat+3010l
    • http://shopyou.online/scag_tiger_cat_drive_belt_diagramn2li8.pdf
    • https://cdn.sqhk.co/wadusazilox/lxjjfgh/33798065384.pdf
    • https://static.s123-cdn-static.com/uploads/4452588/normal_5ff771ea38ab5.pdf
    • https://kumobavogi.weebly.com/uploads/1/3/2/3/132303339/7220465.pdf
    • https://cdn-cms.f-static.net/uploads/4374852/normal_60146db58e359.pdf
    • https://cdn-cms.f-static.net/uploads/4466391/normal_600ea4e2b0f70.pdf
    • https://cdn-cms.f-static.net/uploads/4454968/normal_603cbcbca81dc.pdf
    • http://wogivodugakovek.mygamesonline.org/mililitros_a_gramos_mantequilla.pdf
    • http://clubstore.info/list_of_core_values_for_studentskzm1x.pdf
    • https://sebikiwar.weebly.com/uploads/1/3/5/9/135962157/vofopa.pdf
    • https://memezuwiz.weebly.com/uploads/1/3/4/7/134702577/xukoviwi.pdf
    • https://cdn-cms.f-static.net/uploads/4449630/normal_602c1f836458b.pdf
    • http://edalovert.xyz/kujadesi8et1a.pdf
    • https://static.s123-cdn-static.com/uploads/4401982/normal_5ffdc4c2f1fc6.pdf
    • https://cdn.sqhk.co/webepinovet/gajhIja/steam_download_stopping_randomly.pdf
    • https://cdn-cms.f-static.net/uploads/4459645/normal_6029abf7527b3.pdf
    • http://zatutajijiti.getenjoyment.net/how_much_is_a_fisher_wood_stove_worth.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nununad.myartsonline.com/xujawivoguwupomawef.pdf
    • http://penobugixova.atwebpages.com/abecedario_de_lettering.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
    • 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_off0000f1cd.bin
c98e8cbcee09fba78c61cb5f11afaab0707cb0d6fb60393036b8297f417c18f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 5716 bytes
font_01_sfnt_off00010516.bin
f50733386b60ff6d3ccde936e7cb6ab0a0b6429b4c754931f7d412162650d2df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 10696 bytes
font_02_sfnt_off000129de.bin
caaaf8b4231b3b2ca618a57a000a85a178bf3bbfec8a15adff5f454c244a6fcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129DE 16820 bytes

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