Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5cbd65349ef1a9…

MALICIOUS

PDF

76.6 KB Created: 2021-04-02 23:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5f11b395eccadfac2dfad80d3246551a SHA-1: 5b8419aad46d1b6b66adc28775024a620c03a148 SHA-256: 5e5cbd65349ef1a982091984793e4831c401d0c7e5b03f569759f108d68ea369
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 0.9991

Heuristics 6

  • 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.
  • 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://druttle.ru/strik?utm_term=what+do+snakes+in+water+mean+in+dreams PDF link annotation
    • http://kafalukuwemi.mygamesonline.org/pujetisebepowi.pdfIn PDF document text
    • https://kazowutulegopos.weebly.com/uploads/1/3/5/3/135324393/resizugipi.pdfIn PDF document text
    • https://busonuvawariba.weebly.com/uploads/1/3/4/3/134355681/17587d89a0d3.pdfIn PDF document text
    • https://nekazexupogufeg.weebly.com/uploads/1/3/1/4/131454238/bajimuzadilemo-lowifog-wamek.pdfIn PDF document text
    • https://zonozedu.weebly.com/uploads/1/3/0/8/130874021/1142052.pdfIn PDF document text
    • http://tujidal.mypressonline.com/betty_friedan_the_feminine_mystique.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/aromaterapia_aceites_esenciales.pdfIn PDF document text
    • https://gumevimarijefa.weebly.com/uploads/1/3/1/0/131071167/5696068.pdfIn PDF document text
    • http://wijutomotagam.mypressonline.com/43313641533.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/jidini.pdfIn PDF document text
    • https://nijuvabuf.weebly.com/uploads/1/3/5/3/135326727/8a9eaa6124.pdfIn PDF document text
    • https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/526538be.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/dsp_algorithms_in_c.pdfIn PDF document text
    • https://wenibowefopari.weebly.com/uploads/1/3/0/8/130814001/471ed6bb000c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fb1cd387-549b-40f1-a5a4-67fd65d29bb3.filesusr.com/ugd/4200b4_7e73bdfedc0e422fb73db9842d1a717a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/34f6ebd4-f07f-421e-97a9-dd89a1b07718/vumizojamumimedani.pdfIn PDF document text
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_ba239c0d127f4bc385d4175ad907bd0c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e02d5cd5-4ceb-4932-ac28-d7ce3439e50b/manejo_del_cultivo_de_arroz_en_ecuador.pdfIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_2928331f6a3d43b2ad27ba5f138ab91e.pdf?index=trueIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_0e560d7f7f4141109ae7cd90448bfd6e.pdf?index=trueIn PDF document text
    • http://legokejapo.atwebpages.com/gidifofolaran.pdfIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_11f94fc5dfdd45fe8959e75f58680cb7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a8d31ab-ab80-4326-ab4d-d0cb232f5786/27435294906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b15e2da-3238-464a-9bd1-d55683e85aba/learning_arabic_in_college_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b27844d3-eaf0-4e2c-8f6a-f39645799d46/xixukodavipegov.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_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 5204 bytes
SHA-256: cab4d37d98ed637e724b1406f84cecce237f76fc69c48428a679f59e3507c3ec
font_01_sfnt_off0000fe48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE48 11204 bytes
SHA-256: 2a9ce3d20dd529200cb2a0f74b1320c525813d29c9920094dfa67882fce38993