Malicious PDF — malware analysis report

Static analysis result for SHA-256 031a33f0e6737519…

MALICIOUS

PDF

74.2 KB Created: 2021-06-25 16:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96db397169ec25607f6750aeb01df8b6 SHA-1: cc9dbf91e3cbb3bdd28d7d81e591056dd37624ef SHA-256: 031a33f0e67375197fb4f34db5cbeafef8aa278f587241d5db5a767d9f318d4d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a mass of external links, likely to manipulate search engine results or distribute further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or content-distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bidegibi.weebly.com/uploads/1/3/4/4/134476665/kakor-nuzagutux-nolulekumosep.pdf
    • https://static.s123-cdn-static.com/uploads/4444378/normal_5febc7773f47d.pdf
    • https://cdn-cms.f-static.net/uploads/4378605/normal_60421e727ab26.pdf
    • https://static.s123-cdn-static.com/uploads/4497638/normal_5fece95b65051.pdf
    • https://pugufatafa.weebly.com/uploads/1/3/5/9/135967981/0e4f7f06af2f401.pdf
    • https://cdn-cms.f-static.net/uploads/4388814/normal_605ee85f5b671.pdf
    • https://vazewelekataba.weebly.com/uploads/1/3/1/6/131606588/tadumolamof-nijubaba-vewiborisopotum-dabuneza.pdf
    • https://porovepo.weebly.com/uploads/1/3/4/5/134527374/b1144b296.pdf
    • https://nojiwikimina.weebly.com/uploads/1/3/5/3/135315372/zowigew_xazaditipa_nosamawabobexi_pitinuforej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/sq/ugae/~3/X6hrLWyzjlw/square?utm_term=2nd+puc+maths+previous+year+question+papers+with+answers+pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60d07de3fa150c70232b1d6a/1624276451425/sword_art_online_season_3_watch.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60cd121aa850a767f7b1ad09/1624052250301/vezipufe.pdf
    • https://uploads.strikinglycdn.com/files/5a5f6cf5-be0c-4c4a-a7e2-e0abc220f24e/netgear_wgr614_custom_firmware.pdf
    • https://uploads.strikinglycdn.com/files/609f08eb-a300-47a5-9a0a-c2a60e426f53/45792616214.pdf
    • https://uploads.strikinglycdn.com/files/a2f96b8f-872e-4002-89e3-1f237e0e4f5e/56217395226.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60c8c20fe376041965ad84ed/1623769615666/2146194580.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60c569e60aea5d001f3765b1/1623550440337/36710180821.pdf
    • https://uploads.strikinglycdn.com/files/1cbe2117-aa40-4fc6-b6e9-cff87a30f106/la_iliada_descargar_gratis.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60d18debbc8e392e0436d8bf/1624346091992/90438649762.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60d23f2dacc6db5017d2eac7/1624391469771/build_a_smokehouse.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ce0e63ff2943704dc6153a/1624116835678/sivaji_the_boss_movie_download.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60c536a1a7da8d1d214fe955/1623537314454/xxx_new_album.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60c49465098e55621d28c39b/1623495782389/96858794219.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e134.bin
4532268e272a486df5fdd9833ce417e53e08521fab9bd7b2c1b24d66d6c58a9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 5780 bytes
font_01_sfnt_off0000f4d0.bin
da700b7a67684ccc13ad028f603679e00461ad780eeba783452199bfdbf1ea2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D0 10464 bytes

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