Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c78f40000f2254…

MALICIOUS

PDF

127.5 KB Created: 2021-05-28 10:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 98f50030b9030774df5baa03bc3aa7f8 SHA-1: 814a8e5a668f12634ea857fbc5c47bf72af7d1ce SHA-256: e5c78f40000f2254b8dd9f299ff407d7e18b80e333f9d9322affbd1921139942
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 0.9937

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://mezovuduw.ru/strik?utm_term=anatomy+and+physiology+coloring+workbook+ch+6 PDF link annotation
    • https://gojenegitoz.weebly.com/uploads/1/3/4/3/134387591/luvezo_lotekexudodet_zuxutenolifol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379723/normal_5fe2583bbf45a.pdfIn PDF document text
    • https://zuwunofotu.weebly.com/uploads/1/3/4/2/134265599/wowevupovut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428083/normal_6012299f52682.pdfIn PDF document text
    • https://lojavexir.weebly.com/uploads/1/3/5/9/135963097/vavuboj-pexisewobilo-foveke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405420/normal_602a8b66b7823.pdfIn PDF document text
    • https://luwuberukad.weebly.com/uploads/1/3/1/4/131409546/simewobe_tugide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427077/normal_5ff8b18813305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_606d212d1bb1c.pdfIn PDF document text
    • https://vemomomofaj.weebly.com/uploads/1/3/2/7/132740815/7132823.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422640/normal_6068b9cbc4563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411714/normal_60281e7a6d73c.pdfIn PDF document text
    • https://ponuxarazuzega.weebly.com/uploads/1/3/5/3/135328107/supidoporidifevu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401985/normal_5fc87c4b2012a.pdfIn PDF document text
    • https://wupuvogobed.weebly.com/uploads/1/3/4/5/134507139/22693c293.pdfIn PDF document text
    • https://nekitunanozot.weebly.com/uploads/1/3/5/3/135346928/e25ae97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448346/normal_605bddec4beeb.pdfIn PDF document text
    • https://maposege.weebly.com/uploads/1/3/1/3/131378999/4916132.pdfIn PDF document text
    • https://nawikavo.weebly.com/uploads/1/3/0/8/130814462/59c861c5bc7f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/bea9f84e-8fd7-4f72-9601-909abcf37453/what_is_a_called_bond_or_redemption_notice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da4a633c-6a02-458b-91c6-fe34abf4fddc/14296645431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5505f3f-8a43-43a3-9062-fafde522534d/44886222440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50e5fbf0-a840-4b75-916c-3b384bb86803/60661426571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e3f365-4765-4db4-a291-f66e1a22810d/pimuletusazevenudosulij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec8f4e74-fffb-4c47-bfea-1f7be0515ff2/94871503475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b9fb1a-0d4a-45bd-9838-094a81d550a4/ti-82_stats_grafrknare_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/143aee1c-0499-4e59-8ada-368812b91c62/heil_furnace_error_code_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb83489a-f9f9-4cc6-9ab0-27808c898b07/tipalosogexupuja.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19115 3368 bytes
SHA-256: af68e5b1f937c352b93499d49ead012793058d2d46d2f20f6aa811b6a9aa50ea
font_01_sfnt_off00019d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D31 5700 bytes
SHA-256: f70881528ebfd3008564d901e494a924c69ebcda32de5b5908800e2dc0ea166f
font_02_sfnt_off0001b06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B06E 15472 bytes
SHA-256: 50aaba61d8e922b8ccb87994ac99858038771bb44809bd17a6a5c1fd3a3656af
font_03_sfnt_off0001df88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF88 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333