Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eec9490da4b296e…

MALICIOUS

PDF

76.2 KB Created: 2021-05-27 03:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e3b8363aa8e0982226d78ef1b7094720 SHA-1: 53c2acfef8c9b2e965618fdd22d3e7a6ef39e7f2 SHA-256: 9eec9490da4b296ebc84572379c75f398d7d662011811a998f150ee2d07c5587
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://resalured.ru/strik?utm_term=modsy+promo+code+june+2020 PDF link annotation
    • https://tunuwadubozowe.weebly.com/uploads/1/3/4/3/134363043/232726.pdfIn PDF document text
    • https://kokozorakozuwel.weebly.com/uploads/1/3/0/7/130775651/fegadidaxa.pdfIn PDF document text
    • https://pupifino.weebly.com/uploads/1/3/0/7/130776741/mewipulukogasosape.pdfIn PDF document text
    • https://kafekejanabex.weebly.com/uploads/1/3/2/7/132740445/dotitama.pdfIn PDF document text
    • https://fitulepam.weebly.com/uploads/1/3/0/8/130874207/pazakota-depumud-nerag.pdfIn PDF document text
    • https://jakugogafezokev.weebly.com/uploads/1/3/1/4/131437362/wegiwi.pdfIn PDF document text
    • https://wutupebepa.weebly.com/uploads/1/3/3/9/133997315/6659407bf.pdfIn PDF document text
    • https://nejuxudukekiti.weebly.com/uploads/1/3/0/8/130874136/godiganurixese.pdfIn PDF document text
    • https://wudujadulaneg.weebly.com/uploads/1/3/0/7/130738887/1124354.pdfIn PDF document text
    • https://tajusubinem.weebly.com/uploads/1/3/4/8/134886452/rebavukepa.pdfIn PDF document text
    • https://fukagopesuzidad.weebly.com/uploads/1/3/1/3/131381553/lizogibigevoma-xepuxusulab-xovuwune-perulurubiwovot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/73bd2b1d-0901-423f-ba7c-2c67db40db57/dobilediw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce75f359-5080-4d3f-ad6c-3da8f541393b/calligraphy_alphabet_fonts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e8ab957-b0fd-4c6d-a41c-e4c30eacacf7/10005089385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c20a2bab-321d-4c7e-b0c8-69989ab12390/definicion_de_economia_segun_autores_economistas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/439ea4ce-9263-4ce6-ad01-c82170956a5c/xonelikatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20179a88-3f3c-4079-8dea-fad3d9a17235/18270955839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ff0d81-c75a-4348-8ef6-51233e7144d2/java_beginner_to_advanced_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db293b5b-ac4f-4d1d-ba26-fcd7466d7413/80840559408.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_off0000eb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 5436 bytes
SHA-256: 684a6cba3c02996267c60d0e53ad2011c6799ad9bbd79c388bd1a2adb442bc82
font_01_sfnt_off0000fdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 11128 bytes
SHA-256: 549145b9ccb007db264e2549dfc0a3225b4dd9273690777dc1125220ad729ca6

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