Malicious PDF — malware analysis report

Static analysis result for SHA-256 123aca366795ba33…

MALICIOUS

PDF

77.8 KB Created: 2021-03-16 13:13:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25e414e44b9641a021386a356cead773 SHA-1: 24548a1d929d9b702e9a81d5b05fc593b2bcaf68 SHA-256: 123aca366795ba33f4d1df0f0480d275074f7ddd518c02b9f184917fda20285b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, suggesting it might be a generated document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://resalured.ru/award?keyword=ca+125+elevado+causas+pdf
    • https://bizavewes.weebly.com/uploads/1/3/5/3/135323934/gizivanoti_relujofi_lapodo.pdf
    • https://static.s123-cdn-static.com/uploads/4415326/normal_5fe171c12ba57.pdf
    • https://static.s123-cdn-static.com/uploads/4489988/normal_5fee6ca018ec6.pdf
    • https://rosajojuzexoked.weebly.com/uploads/1/3/0/8/130874599/7ee62.pdf
    • https://sarejazaxixosib.weebly.com/uploads/1/3/4/6/134633098/wawixabimekagatad.pdf
    • https://static.s123-cdn-static.com/uploads/4420441/normal_5fc86e78605e6.pdf
    • http://kafalukuwemi.mygamesonline.org/62984935476.pdf
    • https://mamowolo.weebly.com/uploads/1/3/4/7/134714390/xulixopexudimagulef.pdf
    • http://kejumazinanu.mywebcommunity.org/nugevej.pdf
    • http://jebebixazonutug.mypressonline.com/jowikubajurusumexiraze.pdf
    • https://cdn-cms.f-static.net/uploads/4471946/normal_603ebbe90e31e.pdf
    • https://cdn-cms.f-static.net/uploads/4391634/normal_602ad09141201.pdf
    • http://suwefazimim.medianewsonline.com/56834574049.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vigexosav.myartsonline.com/how_much_does_it_cost_to_get_certified_in_epic.pdf
    • https://s3.amazonaws.com/zupenafud/pesizugikenaboviwesuju.pdf
    • http://gozenabuzixi.onlinewebshop.net/41152583823.pdf
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_a4450752a95046c9a38f7d15450dd424.pdf?index=true
    • https://s3.amazonaws.com/mudurixo/42960124087.pdf
    • https://s3.amazonaws.com/viromibukoleliw/sword_art_online_gameplay_android.pdf
    • http://roxujewov.myartsonline.com/nidaxojevexoropavot.pdf
    • http://jifisuxevizek.myartsonline.com/free_2nd_grade_book_report_template.pdf
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_3fb37e054e4b4192a5ba18886cc676f8.pdf?index=true
    • https://s3.amazonaws.com/mozedijiz/63450922030.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_off0000f091.bin
44b0bb17d6906b756558d1ebbe0e322d336efb450989ac320977e5bfc830dc97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 5328 bytes
font_01_sfnt_off000102dc.bin
854c2c228f1f6a892fdb0e6668934229f74eb287c8382c652f34d2b19fc69e35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102DC 11392 bytes

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