Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba98425f04c5e429…

MALICIOUS

PDF

90.5 KB Created: 2021-03-30 05:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 806704b7ed31f0393c00bc9b62b200b7 SHA-1: b3cab48b100d3976533a5ec5956224f2042bb2f4 SHA-256: ba98425f04c5e429367cbc9396d4eddafd8cf1143580cb6e2ff231f877d5adfe
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' by heuristics, suggesting a tactic to drive traffic to potentially malicious or spam websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO spam. No scripts were extracted, but the presence of many external links points to an attempt to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/wix?keyword=metabolic+factor+customer+reviews
    • http://temiwivixova.iblogger.org/english_language_course_contents.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bfb79b04-db4d-4c54-a74a-4733ff68ceb9.filesusr.com/ugd/11291b_b049169d42664863b0463014ce1e3c89.pdf?index=true
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_9751d4f296c941279460423277e6e193.pdf?index=true
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_807d9b8f52be44fc98bac95bee04eba3.pdf?index=true
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_9f3f15dba8784c308580a48707fbfe78.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c2503d1f-7192-4df6-abda-c72b2003e622/17008304819.pdf
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_e7decd05c6804735ae2abe5b872edcfe.pdf?index=true
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_610783b5a5454f1cb6e51d0e891d951d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/182dd131-e2e2-4b9c-8939-f15c95268a68/how_to_open_older_graco_stroller.pdf
    • https://uploads.strikinglycdn.com/files/9f49549a-dfdb-429f-864f-b49dc408c2aa/12212847867.pdf
    • http://vadisukadanu.rf.gd/60965860170.pdf
    • https://uploads.strikinglycdn.com/files/3049e947-3923-44d6-a5dd-1e6f0a5f5c69/signal_processing_and_linear_systems_bp_lathi_solutions.pdf
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_0e9584136f03404e8162c82696b80f0f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/374d54aa-d175-4bc0-a879-6fab4febfde6/34116011630.pdf
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_5f0e03210a5e40acb2eb6d6730b6a792.pdf?index=true
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_43bbf40cb73d43d09ded4ac44e525cbf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9fed74eb-7cbf-4f8e-b27a-be86180303d5/interior_and_exterior_angles_of_regular_polygons_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/f8a42746-d130-4faf-8f46-cd572215ffd5/future_monster_2_release_date.pdf
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_3092ca360fb44f429e0dc7f2dffeda44.pdf?index=true
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_f360038ad24e4cb699322c7f4249d8ae.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a967f040-f541-4d99-83f3-8152ab21c812/how_to_manifest_something_through_meditation.pdf
    • https://uploads.strikinglycdn.com/files/9a931313-14b8-43d4-bc06-03f1d18fad74/mamiya_rz67_lens_equivalent.pdf
    • https://uploads.strikinglycdn.com/files/7575b31b-e25c-48af-a78f-a327b728c69c/kodak_easyshare_dx6490_usb_cable.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_off00012485.bin
e0b228efc13bc9502b97d6d137501e3493d493781f181b37c17e3dd53cf0c171		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12485 5324 bytes
font_01_sfnt_off000136ac.bin
c993955dd9ba10c50c4bc648c0a446034625e8b53fc9f1da33dd7f1b328592cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136AC 10988 bytes

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