Malicious PDF — malware analysis report

Static analysis result for SHA-256 f799db553d59378b…

MALICIOUS

PDF

87.9 KB Created: 2021-06-01 20:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 22f48cb0efbd05f24937e25424462a40 SHA-1: fc842a635602dc729cf3118cbc9c2f77edb1397f SHA-256: f799db553d59378bcc3f2ac80ba6603560eea698d8495d12b9c89092bc7ba236
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://pelibifir.ru/123?utm_term=makalah+orchitis+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4503214/normal_606b71fc558e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447885/normal_60392285c3773.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470385/normal_6004b87ded0f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372987/normal_6008c55c327fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480594/normal_60371ca065c91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411273/normal_6065b48bb7382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_605df5df26d84.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jesababa.pbworks.com/f/vudubifewitilajazi.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/56414774052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c37655df-50a7-4cb5-8b8b-2d5d4056567c/runimafofasepozukomukigij.pdfIn PDF document text
    • http://muxopal.pbworks.com/f/dakexugerosezuri.pdfIn PDF document text
    • http://wotasaful.pbworks.com/f/emotionally_focused_therapy_for_couples_training.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144412011/chord_sheet_guitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82724c2b-550c-482c-9258-d2c743f903c2/the_binding_of_isaac_antibirth_apk_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1add9e0-84e1-49a8-816a-69274517a11e/zadefeloze.pdfIn PDF document text
    • http://risoxef.pbworks.com/w/file/fetch/144440319/how_do_you_add_more_filters_on_instagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a621519-69af-4aca-8496-6b2c21bb8ed8/el_llano_en_llamas_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2eaf290-e31e-4d95-ae21-9efa2e782929/inequalities_worksheet_6th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86bfbc36-42c8-43fd-b783-2aaa5e768374/19384765701.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/52451862844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b20405d2-cb18-432d-ba8f-3fe302dde80a/dark_souls_3_covenant_rank_rewards.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_off00011c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C30 5312 bytes
SHA-256: b3375ce51a332e5c4955f5dc37dc9f4092d3fbe0665ddafa25d9f7c2b79f78f9
font_01_sfnt_off00012e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E47 10540 bytes
SHA-256: 23db438cf2edfca1c4789fea7a5b5b5e1909a58445c261c5dc5dcc7cabc4fcdd

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