Malicious PDF — malware analysis report

Static analysis result for SHA-256 c291bbb77c19a0fd…

MALICIOUS

PDF

78.2 KB Created: 2021-05-23 15:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2b73097ae2af42a4468cf24406cc2ca7 SHA-1: 570a6f34bfa8f9764dbaaf0936aa1f5e007f2773 SHA-256: c291bbb77c19a0fdc22acfefbf419c5fde805bb43bf938f708c92c0087ee8993
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt, with one primary URL being https://soxebez.ru/strik. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which aligns with the presence of numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://soxebez.ru/strik?utm_term=hang+out+2+student+book+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368978/normal_5fe52cbb9a027.pdfIn PDF document text
    • https://dibevoxatatot.weebly.com/uploads/1/3/1/1/131164568/podirewizaz_pixoditigo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366395/normal_5fcee8d5373bc.pdfIn PDF document text
    • https://rojisubul.weebly.com/uploads/1/3/4/5/134593633/9385327.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483842/normal_603e6e5121be1.pdfIn PDF document text
    • https://rixorololexapi.weebly.com/uploads/1/3/1/8/131857390/legovop_fasebazof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478430/normal_606051f5a8dc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497688/normal_601fa9dce1c8b.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/norozovijalu/tosafiriva.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/web_browser_for_pc_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e51352f3-ee4d-4b78-b27e-70bf8d3fd8e4/the_boy_in_the_striped_pyjamas_novel_activities.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/jorge_luis_borges_poemas_cortos_de_amor.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/mudibulovali.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/how_to_use_battery_calibration_pro_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a843a12b-fcd0-4a1a-a71a-1fd7523faf02/which_boletes_are_poisonous.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f270aa9e-8dfc-4ebb-9937-497271609c3c/bufagukutinerini.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/chrome_app_store_video_er.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/nozew.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/84272840597.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/82108740750.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/psalm_23_5-6_nkjv.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/jaxodafuwikexugozatuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aa70c92-eae5-47c4-981d-033c5d666f03/68307396144.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/582edab3-ab44-4f35-b4c0-376b07f2c7ad/how_long_is_each_ddp_yoga_workout.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/bhakti_and_sufi_movement_upsc.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_off0000eb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 5500 bytes
SHA-256: 644996adb7acbb008f3c0b32c67f3dff2bc45a80501d96a24e70e65d513dca93
font_01_sfnt_off0000fe70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE70 13980 bytes
SHA-256: a05cdc2e5a09885d580563eb72714e5787041f638a5373bb285f79149135beb5

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