Malicious PDF — malware analysis report

Static analysis result for SHA-256 c668a2a2b135be3b…

MALICIOUS

PDF

80.4 KB Created: 2021-03-23 01:54:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1f5d681ed520575b422c4d6fc1f7751e SHA-1: 9aa355718134e7f2da76451655ba58c998963a93 SHA-256: c668a2a2b135be3b6c442c2a3473b79ecc1a36510c70036df40e0cb94c7f154e
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of numerous external links points to the document's primary function as a lure to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://gimoguvi.ru/strik?utm_term=gran+turismo+6+ps3+cheats+tastenkombination PDF link annotation
    • http://fitokaps.xyz/soul_worker_japanese_voice_packqzxn7.pdfIn PDF document text
    • http://juxisuzuvu.iblogger.org/5556114259.pdfIn PDF document text
    • http://gagarinski.su/pasos_para_hacer_un_proyecto_de_investigacion_ejemplo5jndu.pdfIn PDF document text
    • http://spain50off.info/30407347191ekob5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407777/normal_6028d1c1b3263.pdfIn PDF document text
    • http://mon-cmbretagne.com/43151919334826e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393353/normal_600a2272d3187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480749/normal_604825ef1cedd.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/2013_dodge_avenger_oil_filter_walmarto07m2.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://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_b1e84baf35874543a8749690e37221fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/64f95e67-7a38-4c77-8a68-aae9b985f135/31702158747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dda81510-a0ff-42eb-84e0-b9d19df1cf76/free_online_computer_training_classes.pdfIn PDF document text
    • http://galexuduxegi.epizy.com/womof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e05f723-98f5-45bc-91d7-cb47c5624435/befugi.pdfIn PDF document text
    • http://tararefegegelel.rf.gd/28490190844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6370664-b79a-4ac2-b487-b8868ae12d8c/palaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6848810-7a28-4538-8e0a-ec796c100666/turbo_dismount_hack_apk_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0178d24f-0609-4547-a004-5b5ff45c1077/polagitipodirafuwolewiduj.pdfIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_ebed9c17d5cd40f5805ba929ffaf4ef2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a44730de-2ad5-4f99-8f12-db36febcc026/73483185558.pdfIn PDF document text
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_9cd9e305f788407ba83b22cb41e038b5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 5576 bytes
SHA-256: 54ab8e2936d821bb5f499a75c44d6f92162df81723e40bd55c264b8a8751f426
font_01_sfnt_off000100bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BF 10976 bytes
SHA-256: b8281af979edbb621166f6a670bcd82e0c9fca3c4c5554e948bc87677f001f92
font_02_sfnt_off00012614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12614 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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