Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c590136f791c34…

MALICIOUS

PDF

81.5 KB Created: 2021-03-20 13:23:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85b7511b3b55f5b21fa67ebfc0be6772 SHA-1: ba776fcc752cf417ca4b1649bf3357c3a33aac1a SHA-256: a5c590136f791c343d8b68d80b9ddb567b16e46a895aee86c52eef5afe580d72
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to benign-looking PDF files, suggesting a link farm for SEO manipulation or to host phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious URL 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://pelibifir.ru/wix?keyword=protein+synthesis+exercise+worksheet
    • https://zunitaxipef.weebly.com/uploads/1/3/1/3/131398356/sajukixos_setadoboxu.pdf
    • http://tebogekememesij.mygamesonline.org/myron_mixon_bbq_rub.pdf
    • http://magnifioco.site/whirlpool_cabrio_washer_moldgkgmw.pdf
    • http://bonus332.site/3137717004661o7l.pdf
    • http://static-get.top/multiple_choice_test_b2pctqq.pdf
    • https://jaxebenub.weebly.com/uploads/1/3/4/2/134266064/5509585.pdf
    • https://sosojenanoxo.weebly.com/uploads/1/3/5/3/135316520/5751481.pdf
    • http://baffer-shop.space/scunci_900_steamer_instructionsysk9e.pdf
    • http://getliterate.online/what_does_rent_stabilization_meanf2xdv.pdf
    • http://roskycnmx.com/11244721666qk3lt.pdf
    • http://gtmedis.com/gilesagetanogesalogg11k.pdf
    • https://zataxusesuta.weebly.com/uploads/1/3/4/3/134311667/velapebowejenag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_1ff691107a344e9b829614a6fff9419f.pdf?index=true
    • http://juludiripo.myartsonline.com/gol_luigi_garlando_gratis.pdf
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_7a9acf6aa25c4595a32952becf2e545b.pdf?index=true
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_9753e9a710f543c683bf91b5b2bda69e.pdf?index=true
    • http://lobopekogolo.onlinewebshop.net/19448927126.pdf
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_e0ccf98921af4b559ad481ca267e7b63.pdf?index=true
    • http://xutenujute.myartsonline.com/16843229273.pdf
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_88e088131d7c42e3b88eaaca050f2cb4.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_off000101e9.bin
4340f222c267a87c805f9130a0d60a4d2c708c7d9fc6fb3aba9f33df501f6b19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101E9 4972 bytes
font_01_sfnt_off000112f1.bin
5508286cf9e5c4e376c82b66ac01bdf0c945e3ed3eaaca212706f9cec8856ee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112F1 11108 bytes

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