Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ecfc4755b249dd…

MALICIOUS

PDF

92.7 KB Created: 2021-03-05 16:14:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cabd3b6b03ca0fd1b55b887b76c54532 SHA-1: 5cd30d86319046b1fd59c6739f5424e444ad285e SHA-256: 05ecfc4755b249ddd37c001ca89f25a9ed67addac27fc182c230fc4d895d12c5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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/strik?utm_term=irony+examples+in+letter+from+birmingham+jail PDF link annotation
    • http://xunarepozufuz.mygamesonline.org/no_fear_shakespeare_the_tempest_sparknotes.pdfIn PDF document text
    • https://tatujudipopef.weebly.com/uploads/1/3/4/6/134605081/xedef-xalolafor-wimosivuvat.pdfIn PDF document text
    • https://wilowukodol.weebly.com/uploads/1/3/4/8/134881933/f6ec2d5f3de.pdfIn PDF document text
    • http://niburufajanuto.sportsontheweb.net/63005133168.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_3c76db22e4704806b238eb8128e8b2b8.pdf?index=trueIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_53c01ba145b4452281fa36fbaa641048.pdf?index=trueIn PDF document text
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_57fd662317af422593d61cc300b25d2d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39fc913f-6453-4a8f-8634-720958043d96/38056278654.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/7116435332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b94cc24-a0a6-47e2-9137-c313f2aef4b7/1644181195.pdfIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_64c03e7aa0764c958ee7ce01eb20f4e2.pdf?index=trueIn PDF document text
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_1a6f11ab286447c0b30d6a8e225e8a81.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_f86f1a18aa1e4981800e61b64b599e5d.pdf?index=trueIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_f096d53ed16b4175b5b5274106edf670.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/695f7bad-e9e8-4c52-a150-7344d513c743/zotobux.pdfIn PDF document text
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_30da5171e97f4369abfb19837cc907bd.pdf?index=trueIn PDF document text
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_6f97c3cd9fa44073979db4cfa91778be.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/lexupefozolibewug.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/android_adb_settings_command.pdfIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_ba901d09cb484912a45310f027761139.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae690036-c18d-42dd-b89a-ba291ce82d90/vubiwezexo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACB 5424 bytes
SHA-256: c31f5909bdc1381642b75ff5a12d3d5d77c03e30ff1e1564fbd46309be7e7b3b
font_01_sfnt_off00012d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1A 12172 bytes
SHA-256: cec6ff8409efe2dc7f58cb5c7e16b95cd893ca41f69b282fc4dbdf8a79362abe
font_02_sfnt_off00015692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15692 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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