Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c52e09c086f673c…

MALICIOUS

PDF

65.3 KB Created: 2021-02-21 01:21:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 6596301c0bc7f04db87017dc26837f35 SHA-1: 5474668752e93804675db708a559ee6570ff3cf7 SHA-256: 9c52e09c086f673ca65eec2b3cb04ecb1d1dd57ea901405c95c001a15a11958c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or SEO manipulation attack.

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 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://jacksth.ru/123?utm_term=warrior+cats+website+quizzes PDF link annotation
    • http://fastpysystem.online/lukezisagomasogovorsda1y.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/wicsiaJ/vodafone_yan_mda_apk_cark_hilesi.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/hS1ijjd/download_reina_theme_park_world_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/pavetikedur/6hcgcJU/mapesoxovodarezefel.pdfIn PDF document text
    • http://eferevole.com/mtd_lawn_mower_carburetor_partsl2aqy.pdfIn PDF document text
    • http://frontglass.xyz/advent_of_ascension_progress_guide7tusm.pdfIn PDF document text
    • https://lalojitewimagix.weebly.com/uploads/1/3/5/3/135304200/6209764.pdfIn PDF document text
    • https://xijapesulole.weebly.com/uploads/1/3/4/5/134588017/2506320.pdfIn PDF document text
    • https://wobanuwu.weebly.com/uploads/1/3/5/9/135959505/giduz.pdfIn PDF document text
    • https://kesuvovim.weebly.com/uploads/1/3/5/3/135317554/wafelujuduwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/welanisowari/9736607708.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/xegaxijexabosojekazilu.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/1-_300_classic_engineering_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/driver_acer_aspire_one_10_s100x.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/mewizafozijow.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/instrumen_survei_akreditasi_puskesmas_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/minecraft_thaumcraft_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/gw2_armorsmith_leveling_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/chronological_order_of_formation_of_indian_states.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/vizazesakapamiburagekemev.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/61649085013.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/59701968371.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC307 5184 bytes
SHA-256: b5d2c5ad35a371f1d7ae5c5c0fa008903188ea3411250dfd2bd605de9f6fa2a4
font_01_sfnt_off0000d4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DD 10364 bytes
SHA-256: c38bd3124d0402670851674c953f75446566c02cf2b4a8731a8e0895f531efd2

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