Malicious PDF — malware analysis report

Static analysis result for SHA-256 287760ffa8f0ef82…

MALICIOUS

PDF

76.2 KB Created: 2021-03-16 20:48:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0006f41ad689210891a4129dcab38778 SHA-1: c5c4532fd983d915ca1465350f56e124c342c2bb SHA-256: 287760ffa8f0ef82bdc2219d19128a481bb053023484171c43db37f8de4aa07f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking documents, but one key URL points to a suspicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest an attempt to create a link farm for SEO manipulation or to distribute malicious content.

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://seumenha.ru/wix?keyword=vestal+guide+watch+manual PDF link annotation
    • https://nemaxololele.weebly.com/uploads/1/3/5/3/135304154/2104bb939.pdfIn PDF document text
    • https://nubavusixid.weebly.com/uploads/1/3/5/3/135348304/nifofepo.pdfIn PDF document text
    • https://nikulagoronol.weebly.com/uploads/1/3/2/3/132303117/9ed25155.pdfIn PDF document text
    • https://kesegupopu.weebly.com/uploads/1/3/4/1/134131766/3529985.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/why_is_my_lawnmower_backfiring.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/the_odyssey_fagles_edition.pdfIn PDF document text
    • https://kurebefa.weebly.com/uploads/1/3/1/1/131164205/9197090.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/savukojubusum/length_conversion_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06add3d7-a359-481e-bf47-bda963932f30/gaduwikafejujedetexas.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/ielts_speaking_2_topics_with_answers.pdfIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_a9bd04cf8be64f3993c8948f63790fdc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/late_cancellation_policy_template.pdfIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_acc99c007e164010a00bbebc5cc9ffbd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/55030532640.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/play_store_game_for_jio_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/741f3169-5c89-440e-ab78-884b0eb71f25/raymarine_c80_display_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/sugaso.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EC 5312 bytes
SHA-256: 6c31d4832130330b52500405183d13cf73a5f23783f143e96f561113b9f2c8b2
font_01_sfnt_off0000e4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EF 11616 bytes
SHA-256: 1aa7293a1372bb58b9e69a9a207dfc140a940a545e45ddefa83107c4d93dac59
font_02_sfnt_off00010cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD1 16196 bytes
SHA-256: 16841cd06245dfab0499788473f9c5e49459ecbf5940b4b59b8708d0fa28d68c

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