Malicious PDF — malware analysis report

Static analysis result for SHA-256 636913b17203b5e4…

MALICIOUS

PDF

102.3 KB Created: 2021-03-29 19:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d1e582ed03d519befb77093f609ff15 SHA-1: d3b138ca7211ff4c3e2513beb009275c0f1dc586 SHA-256: 636913b17203b5e4c9d1c4c8c4365642d882a1ce0cf745bc547af4caf9ef06a4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO spam operation. One of the embedded URIs, https://kuzutuzo.ru/aws?utm_term=common+core+math+sheets+4th+grade+multiplication, is presented as a lure for educational content, likely to drive traffic to malicious or spam sites. No scripts were extracted, but the PDF structure and numerous external links indicate a phishing or spamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kuzutuzo.ru/aws?utm_term=common+core+math+sheets+4th+grade+multiplication
    • https://cdn-cms.f-static.net/uploads/4388048/normal_5fd105b08702b.pdf
    • https://lobokepodis.weebly.com/uploads/1/3/1/1/131164506/6933685.pdf
    • https://cdn-cms.f-static.net/uploads/4415525/normal_601e0ebb09865.pdf
    • https://static.s123-cdn-static.com/uploads/4451355/normal_5fce3089780f7.pdf
    • https://zikazofikadit.weebly.com/uploads/1/3/0/7/130739129/a1eb8b8c198cd81.pdf
    • https://cdn-cms.f-static.net/uploads/4408340/normal_600c7f79439d1.pdf
    • https://cdn-cms.f-static.net/uploads/4387589/normal_600f59150bf6d.pdf
    • https://junurewumopu.weebly.com/uploads/1/3/2/7/132740614/61d5fdb5e3.pdf
    • http://mumopajikex.mygamesonline.org/cambridge_placement_test_answer_key.pdf
    • https://cdn-cms.f-static.net/uploads/4426063/normal_605a65fd7aaa5.pdf
    • https://static.s123-cdn-static.com/uploads/4380871/normal_5fee351992c3a.pdf
    • http://waferaboteb.mypressonline.com/what_is_an_example_of_scientific_literacy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://www.daltonmaag.com/
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_fb7d0b850a714946b9f446a1899666ba.pdf?index=true
    • http://xusapibu.onlinewebshop.net/simplification_and_approximation_ibps_guide.pdf
    • https://uploads.strikinglycdn.com/files/c7318b4d-054e-4241-965d-fe16a779ec3d/how_to_properly_listen_to_music.pdf
    • http://gixopiv.onlinewebshop.net/brother_8480dn_wireless_setup.pdf
    • http://wiloradakuno.onlinewebshop.net/biocontrol_of_plant_pathogens.pdf
    • https://uploads.strikinglycdn.com/files/da0166c3-8477-464b-a7b3-eafc9c07f1eb/fegofokivijabomexuvo.pdf
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_b346bb1a7d5f4e06abe4b681b93705f9.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
    • http://www.gnu.org/licenses/gpl.html
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f77.bin
c21b4e72d468d0b1765526c91f11f450d5417c037498a939abf8cdae825a595f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F77 5480 bytes
font_01_sfnt_off000131df.bin
4910d0177da9f60ecc92c13a34fae8c5c38ffafb9e4e22a3c3fd987548b79157		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131DF 6148 bytes
font_02_sfnt_off000141c0.bin
6df55d1df1a093d69ebef8ed83b92aa30813e4725c765504a5f0dd3b1642c17e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141C0 10944 bytes
font_03_sfnt_off00016756.bin
a83d11f783c1dece44620ff02a9368a27b843351725dae3c59ed79e93398966f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16756 16176 bytes
font_04_sfnt_off00017c82.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17C82 4324 bytes

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