Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa273492d61ac235…

MALICIOUS

PDF

77.6 KB Created: 2021-03-18 07:31:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0afdb2ba3bb0fb7847dbe21eee37b1ee SHA-1: 556eeede8f3d6e580df977b31834683763b290f5 SHA-256: aa273492d61ac23569e79ec5238a77f058ef48275391143976da4ba23642b4cf
156 Risk Score

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 0.9984

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 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.
  • 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://dugedepap.ru/strik?utm_term=furinno+abbott+corner+computer+desk+with+bookshelf PDF link annotation
    • http://finovadi.iblogger.org/sublime_format_xml_windows.pdfIn PDF document text
    • http://jewogipuwivi.medianewsonline.com/airborne_electromagnetic_survey.pdfIn PDF document text
    • http://medemukiduba.sportsontheweb.net/23046803370.pdfIn PDF document text
    • http://mowogaw.mypressonline.com/25939748226.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://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_a97d120f1c834320ad25e6e75558799d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jinabisura/8_ball_pool_games_free_filehippo.pdfIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_c460a44c4fca4c1e9f38437df84e503b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/vogometupanededunexa.pdfIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_96711ed624ae4d02be4ef936f0bffb06.pdf?index=trueIn PDF document text
    • http://giwofigu.epizy.com/10087489347.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/dotofuxejofojes.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/international_vs_domestic_stock_performance.pdfIn PDF document text
    • http://popefididogake.epizy.com/vocational_assessment.pdfIn PDF document text
    • https://75cc4b12-69da-4024-8422-75f9303faa99.filesusr.com/ugd/d6c222_a82d9391ea8b402c9ca1962182536b84.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votawawo/10904399257.pdfIn PDF document text
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_638b764fad3b4dea9a6ca93449731b82.pdf?index=trueIn PDF document text
    • http://suredutika.rf.gd/lodawa.pdfIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_bfb0069ed45845a19bbfa97e2b1f4f25.pdf?index=trueIn PDF document text
    • http://kewoxorewozox.rf.gd/chemical_engineering_science_template.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_11955d96afe2497d9e255ab5cdbcae51.pdf?index=trueIn PDF document text
    • http://rizivubonulej.atwebpages.com/who_is_carl_rogers_humanistic_psychology.pdfIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_e96165a2697e4876a66f791661bd6e68.pdf?index=trueIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_37b31707c2f8408880b59130abc97501.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 3312 bytes
SHA-256: 19fe6d3511270ee3ff4fbce704f5f4a9fb9182a4344e37e40a38d55828b07e20
font_01_sfnt_off0000e07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07A 5528 bytes
SHA-256: 46b2b41a18f501598a9952bb6a808e0062aca110adf37dfded249117717663d6
font_02_sfnt_off0000f325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 11960 bytes
SHA-256: cfd2a2becab3dd5925171d4de81c96d6cde95fb42568a7d7f6ff8cc71edd5e93
font_03_sfnt_off00011a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378