Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b12a86858cbbe4…

MALICIOUS

PDF

77.1 KB Created: 2021-04-09 10:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e2e1f80ad8e25240a6815d3df09e602 SHA-1: 79865ddb5143747023d822e66422d6a4060404db SHA-256: 23b12a86858cbbe435e1795a6984b0ed7a698798af53f3f9a021726bc3604d5e
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to redirect users to external URLs, with one prominent URL being associated with a phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URL and link farm nature point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=how+to+change+something+into+slope+intercept+form
    • https://cdn-cms.f-static.net/uploads/4410415/normal_6036113e34d2d.pdf
    • https://cdn-cms.f-static.net/uploads/4491148/normal_5fdb1b16baddb.pdf
    • https://static.s123-cdn-static.com/uploads/4454547/normal_5ff2f2439fac4.pdf
    • http://sunugukumota.getenjoyment.net/addition_and_subtraction_word_problems_year_6.pdf
    • http://lobafor.mypressonline.com/37600360367.pdf
    • http://nadefememidep.medianewsonline.com/vemenew.pdf
    • https://cdn-cms.f-static.net/uploads/4411498/normal_602da644eab36.pdf
    • https://static.s123-cdn-static.com/uploads/4494165/normal_5ff614b8e0d3b.pdf
    • http://jonipifenukiz.mygamesonline.org/71223530981.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_500c77057421484eac5a44cea4023592.pdf?index=true
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_a81e91fc1d3044b2925cb440a972f274.pdf?index=true
    • http://megutid.epizy.com/android_camera_test_cases.pdf
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_b5e3837b43ea4665b17b7ae3fd799828.pdf?index=true
    • https://uploads.strikinglycdn.com/files/109f7b63-be78-4d4f-abac-6974d614e861/ms_excel_2016_practice_exercises.pdf
    • http://xobiluwova.epizy.com/3245073055.pdf
    • http://bolirazebaf.myartsonline.com/jozujigotarakomi.pdf
    • http://gezexibubaju.rf.gd/workbook_sheet_activate_vba.pdf
    • http://kunuzozadaza.epizy.com/jijopepelaxuwakeboresido.pdf
    • http://firasala.epizy.com/rearrange_pages_in_adobe_acrobat_reader.pdf
    • https://uploads.strikinglycdn.com/files/ca40b21c-e93d-4e75-ae52-afc6f70cc9b1/duseguxofagabatogivakezo.pdf
    • http://dadusuxu.rf.gd/best_paid_android_rpg.pdf
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_ba971cbf2cc1485089a294ba9f930519.pdf?index=true
    • http://bedekopezedegej.rf.gd/81582061432.pdf
    • http://mipuvofelope.epizy.com/zevikufokijizupetita.pdf
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_820d01651ac74cafb2b8c1685b255d92.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_off0000ed93.bin
b4ba8e5949163fc73c945ca1636970e721f8444ba62ac12ce24bf9df8d6f74c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 5480 bytes
font_01_sfnt_off00010024.bin
7004ea50fbfce62fd3cc4d2f94083905a7eaf7305a17ea32c0f01c9a9f827d05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 11252 bytes

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