Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d754727a4ab640…

MALICIOUS

PDF

80.7 KB Created: 2021-04-05 17:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: acf5af736f70b04790bb2e240d580479 SHA-1: 5db4baafe1013132c2077a1c11315431731a5bac SHA-256: 83d754727a4ab640510d35d3d8f2f4c3d863a4e0d35c202e14b79194b1bb91ae
186 Risk Score

Malware Insights

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

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 0.9990

Heuristics 6

  • 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.
  • 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://leonvi.ru/wix?keyword=ap+world+history+final+exam+study+guide+quizlet PDF link annotation
    • https://simebusuf.weebly.com/uploads/1/3/1/4/131406507/8e5fb.pdfIn PDF document text
    • https://zezonusadife.weebly.com/uploads/1/3/1/4/131410479/vurawib_gorijipolemudup_fenewe.pdfIn PDF document text
    • https://boliminukedakos.weebly.com/uploads/1/3/4/4/134494229/8621505.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/income_certificate_format_in_english.pdfIn PDF document text
    • https://juwujumatel.weebly.com/uploads/1/3/4/0/134042908/zizalifidafuvipub.pdfIn PDF document text
    • https://lixawedubofalat.weebly.com/uploads/1/3/1/4/131407760/ea0f8a9b8e25de6.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/82702500616.pdfIn PDF document text
    • https://vifabuwu.weebly.com/uploads/1/3/1/6/131606679/nepomuvivopenifa.pdfIn PDF document text
    • http://semasinizitowo.medianewsonline.com/mummies_magic_and_medicine_in_ancient_egypt.pdfIn PDF document text
    • https://sesubovokur.weebly.com/uploads/1/3/4/3/134311777/1652633.pdfIn PDF document text
    • https://nobigifawu.weebly.com/uploads/1/3/4/3/134310244/xakojalidexerutif.pdfIn PDF document text
    • https://lepitedow.weebly.com/uploads/1/3/4/8/134885181/nibekulo_misozi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zulolabopel.myartsonline.com/vikijikepalujerop.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/how_to_reference_a_newspaper_article_apa_6th_edition.pdfIn PDF document text
    • https://d798de41-6847-46d1-b877-4f1b84f556ee.filesusr.com/ugd/3e315c_9f42519b6bb44c889c3e34efb9f4b584.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/microelectronic_circuit_design_3rd_edition_solution_manual.pdfIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_a61044a19bcc44cf9d88183caa49f1db.pdf?index=trueIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_c35ef464b14a450ca6197cf4a8cc47f9.pdf?index=trueIn PDF document text
    • https://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_2ec668abf9254514933c911562e1bdd0.pdf?index=trueIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_2da6bacc7e8e4f50898906f0984cbb36.pdf?index=trueIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_552425a5fbd14146bf06d13f2753dc9e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/40478469084.pdfIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_ecf69950ee68427e87dd9d9b607347d8.pdf?index=trueIn PDF document text
    • https://0ed30ddb-3df1-4505-9e4e-3e87fc6d20ea.filesusr.com/ugd/f043c1_1eef798fa719427fb805409b30515804.pdf?index=trueIn PDF document text
    • https://0ddd2631-58c7-464c-86d0-a5d1d8121c04.filesusr.com/ugd/301b85_5cd980c263ec4c93905e0f094e675afb.pdf?index=trueIn 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_off0000f748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF748 5880 bytes
SHA-256: 7d3c9d1cf831a44e5f3c03c26c4ba5dbe1ae1634d04f85ed001597b4fe1db836
font_01_sfnt_off00010b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3E 13220 bytes
SHA-256: d9c26b831670c631f4cfb0cc6f40a01b6cb50e8dbae5393399d4ae0ff3912831

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