Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ac49410e0acc88…

MALICIOUS

PDF

73.2 KB Created: 2021-03-17 21:49:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 432b2ff2d33654c9f1eb2e1af64e4f98 SHA-1: db292acae2c15c18be0d968eec0a29c9fe817154 SHA-256: 81ac49410e0acc88531a296d384e463c8fe969b5a2d15ec9b103e7f5461a1f97
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, including a link farm, suggesting it's used for SEO manipulation or to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure itself are indicative of techniques used to deliver malicious content or redirect users.

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-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://dafemum.ru/wix?keyword=thank+you+letter+for+nurse+mentor
    • http://zijafanovidiz.sportsontheweb.net/the_rabbits_who_caused_all_the_trouble_bangla.pdf
    • https://newosupileseru.weebly.com/uploads/1/3/2/3/132303396/zomubarujatuxiv.pdf
    • http://veruvipavopa.getenjoyment.net/wexusewipibamaxiv.pdf
    • http://fosipuzo.mypressonline.com/what_is_a_2007_honda_fit_worth.pdf
    • https://cdn-cms.f-static.net/uploads/4413587/normal_602e850ed9666.pdf
    • https://foboxujegi.weebly.com/uploads/1/3/4/6/134694162/rafelabikir-jeteseperava-novinitana-rafeduweg.pdf
    • https://static.s123-cdn-static.com/uploads/4454558/normal_5ff4b5a63308a.pdf
    • https://cdn-cms.f-static.net/uploads/4448551/normal_601f58c2ef3cf.pdf
    • https://cdn-cms.f-static.net/uploads/4455374/normal_60364ced5800b.pdf
    • https://lapedifulijep.weebly.com/uploads/1/3/0/7/130739603/fagajadamowitaz.pdf
    • https://verumoxozuvije.weebly.com/uploads/1/3/1/4/131407377/nugigirerejitu.pdf
    • https://lutasuboli.weebly.com/uploads/1/3/2/7/132740498/1944431.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_47f96dcafc88446ebeceb45de5a1e8cb.pdf?index=true
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_2144d5800b4148af9e5f95750e603c37.pdf?index=true
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_2ce70f3a998148c29f2a7c88605fa676.pdf?index=true
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_4775bd22a66a4a8ea9924b3690978f11.pdf?index=true
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_7ce02702ef804adeb4141ce89f83ef5d.pdf?index=true
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_8b03bc869a2941a7af76c6231d2a5c5c.pdf?index=true
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_38ebff9bc46c49908bece24218c15cbc.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_off0000e341.bin
46bd61bea7e505871104f94c3d2fcff7b8097861118b84ff95d787b0f6e683d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE341 5120 bytes
font_01_sfnt_off0000f48d.bin
bea36a4c33c463bf965aaf0ffe8ea0494d047547dc03e31b851a49617ef53e46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 10292 bytes

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