Malicious PDF — malware analysis report

Static analysis result for SHA-256 256d598f9af4f470…

MALICIOUS

PDF

76.9 KB Created: 2021-05-19 18:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 000361bc71ab68fc7ceee3a6f9981d37 SHA-1: cd7c862799f68c764e45ecd798b47c10786e9cc3 SHA-256: 256d598f9af4f470fe583eb93b49fda76aa6ecac758f4d53fa7dc3e1225929f7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains a large number of external links, characteristic of a link farm, with the primary suspicious URL being 'https://leonvi.ru/wb?keyword=sonic%20shake%20cup%20sizes'. The document body, though heavily obfuscated, appears to be a lure related to search terms, aiming to direct users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wb?keyword=sonic%20shake%20cup%20sizes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378620/normal_60111cd557d80.pdfIn PDF document text
    • https://sopunarexij.weebly.com/uploads/1/3/1/8/131857112/5434704.pdfIn PDF document text
    • https://bagubabijotete.weebly.com/uploads/1/3/4/3/134319258/7143e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451755/normal_5fdde8a212b50.pdfIn PDF document text
    • https://dagazafija.weebly.com/uploads/1/3/1/4/131484603/sutafebilat-vuruloliwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387929/normal_601c6c87dbf37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416322/normal_603e6dc873d70.pdfIn PDF document text
    • https://fiwofufoneronup.weebly.com/uploads/1/3/1/0/131071066/zevid.pdfIn PDF document text
    • https://basosogufu.weebly.com/uploads/1/3/4/6/134682995/7883377.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/bepukuba/2015_lexus_is_350_f_sport_horsepower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf23d427-7854-4d69-bf04-7ad436011a00/refutavenivesuresiwob.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/vishnu_sahasranamam_hindi_with_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/26148681554.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/21134563215.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/huckleberry_finn_reading_questions_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbfe72d4-d2ff-4efa-802f-a971ae1cf7eb/96211114291.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/34743384081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea15b91b-b511-45d3-8c13-fb5c5fe219e3/the_feeling_of_what_happens_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7270778-9a26-49f5-aa97-89e698d58fcf/apollo_twin_x_software_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/candy_crush_soda_hack_apk_ios.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_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 5108 bytes
SHA-256: d71a6b4a8b863a3dc0d2eab824c9592ee58abf9bb1e3f168102c161b794dde82
font_01_sfnt_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 10984 bytes
SHA-256: c2a616daf4265219ba1c3dcd6c350599d7774d6053ee5dc45a8913149823cec2

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