Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75f7cfc7fb14df4…

MALICIOUS

PDF

71.3 KB Created: 2021-03-31 20:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 302f3a09b51f020db2a9afe313cb75b9 SHA-1: 14d89827ade38071dcbb1fe95645469c934b7a08 SHA-256: b75f7cfc7fb14df44fba72b5590cb59f34019f19d2e39e034bab04c67e555ca9
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://zajinet.ru/wix?keyword=accompanies+career+opportunities+floral+industry+student+worksheet PDF link annotation
    • http://scm03.ru/snapseed_photo_editing_app_for_laptopojh9b.pdfIn PDF document text
    • http://defokozixeral.sportsontheweb.net/32042229701.pdfIn PDF document text
    • https://rudazijix.weebly.com/uploads/1/3/1/4/131453676/8933862.pdfIn PDF document text
    • https://pilonalamajavex.weebly.com/uploads/1/3/1/1/131164122/9508644.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/25187309955.pdfIn PDF document text
    • https://novunafa.weebly.com/uploads/1/3/1/3/131379228/gurabukixurop.pdfIn PDF document text
    • http://devgame.design/povuw02g52.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/4bf585da-cf9e-4c0a-8dbb-c01c91ad00a5/how_to_set_timex_ironman_30_lap_watch.pdfIn PDF document text
    • https://dc5ca969-d333-4582-9879-b719aca70d73.filesusr.com/ugd/760c43_3420dc53715f4a9f98d8e1f6bb11713e.pdf?index=trueIn PDF document text
    • https://16cc4848-9a85-487f-bc1d-da55f68f8448.filesusr.com/ugd/dcf86b_85b0bc4ba3f349dfaab44a48918c5642.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b04c9edb-a465-4a5e-b043-b5836c7d895d/vubegitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e2a9010-d641-45ed-a8d3-5901f9848e4c/werux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fb24d2a-eb7d-4677-8d95-e34f8229c490/87200655149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38fe032e-7e67-4e79-a61d-58a7136fcd30/jokabenulogitunasufopilaw.pdfIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_384e731123464ee6bf533b9c85738302.pdf?index=trueIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_dd35ecf5a6e146dab3473b18f23686b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a52aedf-2028-4f11-be58-d5c83276f376/vosebuduvavoziwodar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eea8471-df11-4faa-9301-9a9ce4e17534/penny_stocks_to_buy_today_india_november_2020.pdfIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_61486d8dd69e40d08bb062a4a9f011d9.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_off0000d5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A9 5640 bytes
SHA-256: 7c09f12506ab83ed57375b278962e48987fdfacc42f9e94bdf03e9658c635a53
font_01_sfnt_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 10752 bytes
SHA-256: 2aac225df3ddb53da828ea311ac25064a417e329cd6db8b96bcf3fdbe2709501

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