Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb6e31bbb7359fe…

MALICIOUS

PDF

76.6 KB Created: 2021-03-13 18:58:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a418d7d2695a11dd7e812c8def88c8c0 SHA-1: b2d810b131f34a8bb7a38ba68eacdd7f034b8f52 SHA-256: ebb6e31bbb7359fe06d20d57fb9ebf9578f17da18efddf6da1f66e27c600c167
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, directing users to various PDF files hosted on external domains. The heuristic 'PDF_SEO_LINK_FARM' and the presence of many unknown reputation URLs strongly suggest a malicious intent to redirect users. The ML classifier and ClamAV detection further confirm its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/123?utm_term=bpsc+ae+pre+syllabus+pdf
    • https://dosolixegu.weebly.com/uploads/1/3/4/3/134340741/jakujew.pdf
    • https://tojaxufuvubugo.weebly.com/uploads/1/3/4/6/134641466/28bbc807b.pdf
    • https://static.s123-cdn-static.com/uploads/4383445/normal_6003f23b00025.pdf
    • https://static.s123-cdn-static.com/uploads/4423715/normal_5fe059fbca2d1.pdf
    • https://zupufirelerige.weebly.com/uploads/1/3/0/9/130969681/bemozupibakozukir.pdf
    • https://static.s123-cdn-static.com/uploads/4445555/normal_5fde5b059a5c2.pdf
    • https://wunilozufepen.weebly.com/uploads/1/3/4/6/134600637/depokamuwinezib-ketireviruwofo-zokafitim-zutibineli.pdf
    • https://jolewewovu.weebly.com/uploads/1/3/6/0/136087062/154493.pdf
    • http://xijulefabogi.getenjoyment.net/vasutumovemusiminenedataf.pdf
    • https://momigetufi.weebly.com/uploads/1/3/4/8/134876151/6ba5fd5e18fe.pdf
    • https://mevepabazeme.weebly.com/uploads/1/3/4/0/134013418/kulazovepabu.pdf
    • https://ketijumorowifop.weebly.com/uploads/1/3/2/6/132682879/67fb7d78adff922.pdf
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/zamisoguxej.pdf
    • https://cdn-cms.f-static.net/uploads/4391636/normal_5fdb3570e50bb.pdf
    • https://cdn-cms.f-static.net/uploads/4458132/normal_5fd90fa03077b.pdf
    • https://zazozoke.weebly.com/uploads/1/3/0/7/130776388/5921663.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_a85911590d2f4f11a9bb66fcc8ac80a3.pdf?index=true
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_bac8378c1efc4c57b79c93b6a195dced.pdf?index=true
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_b37292fb93594f7ca1dda93f88a4fa25.pdf?index=true
    • http://zimopup.myartsonline.com/81254779381.pdf
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_fddc2b12a82145919d33a7da0862ee75.pdf?index=true
    • http://guwaxilajoxeza.onlinewebshop.net/atoms_for_peace_speech.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_off0000eaed.bin
95e8568b2942e6abf84e7185b1ec6aec61e858068993ea736bec276bbe1ceb4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAED 5440 bytes
font_01_sfnt_off0000fd80.bin
d4e1a111d8d2b5dee733cd8cad59830b7b30127e291453e124627d28f546eced		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD80 11160 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.