Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a50101b2afcbbb…

MALICIOUS

PDF

85.5 KB Created: 2021-03-15 14:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f5a189b2fca29d584cd74fe1f69b274 SHA-1: 23be28eecb481e49e00c198d3738b327b235f788 SHA-256: d6a50101b2afcbbbaf42eee0518027bd2a85400f2afa09957b320999d9c18395
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with the primary suspicious URL being https://jacksth.ru/award?keyword=arquitectura+gotica+libro+pdf. This suggests a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=arquitectura+gotica+libro+pdf
    • http://tafuvomilo.22web.org/cannon_80_safe_review.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/widuxade/21632991436.pdf
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_009d8f9f38ad4c0d940ac74187523fa6.pdf?index=true
    • https://s3.amazonaws.com/mogedozara/geometry_complementary_and_supplementary_angles_worksheet_answers.pdf
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_38015b659fcf408490c1ab9b85e368c4.pdf?index=true
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_e712ea212da244b68c36109e05e5049e.pdf?index=true
    • https://s3.amazonaws.com/bulikowexunepov/74310453676.pdf
    • https://uploads.strikinglycdn.com/files/48027192-6937-406d-8163-ee443a77691b/why_is_my_air_conditioner_not_cold_enough.pdf
    • https://uploads.strikinglycdn.com/files/29fc4802-0b6b-4e11-b80d-2f1c596eafc1/craftsman_190cc_lawn_mower_oil_change.pdf
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_17b71349de7447a0b4696554dc296d65.pdf?index=true
    • https://s3.amazonaws.com/fapaga/18659814119.pdf
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_b2fbfe7d871645fb8999c9f9b82a3eb5.pdf?index=true
    • https://s3.amazonaws.com/zuguvoxoki/rixatixemibasozetofup.pdf
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_58c81c51fec342efb9e1427c3cd8fc1e.pdf?index=true
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_1270eca1a6a34180a3a9718557c418a3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/553da036-fff7-477a-a432-8bf702850a28/bijujoxiwiwukunotajanodi.pdf
    • http://kokexaxuseru.epizy.com/kgb_archiver_for_pc_windows_10.pdf
    • https://s3.amazonaws.com/divelikubapiwaj/23665211487.pdf
    • https://s3.amazonaws.com/fejififimaketo/xetevenewakor.pdf
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_60a994a0f3ba4c53899d67c17c34456b.pdf?index=true
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_067ada154ad94befa0e423b95d3de67c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/557d6374-8be6-432e-bcd9-aa3596ebdb2d/how_to_create_a_website_with_wordpress.org.pdf
    • https://s3.amazonaws.com/jeromopelurab/80101358155.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffee.bin
717f5ea02d87adf5250c33d46610eaed271e8ffb25bbd5afe7d89d18dbd57ff2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 5176 bytes
font_01_sfnt_off00011191.bin
38646f6bc012f892573edeae554eab5c1cc6b0e98404842a87db90f31e7a05bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11191 11956 bytes
font_02_sfnt_off00013877.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13877 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.