Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb82231d53a34d4…

MALICIOUS

PDF

81.8 KB Created: 2021-03-11 00:23:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 70082288e8e59fe289df94b5023511fb SHA-1: 77d12ad3414ef61bfdfa7a65fde2c98c2fe34974 SHA-256: ebb82231d53a34d4055916848394565bc49a47fd77b13a47096c64af016f8c89
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

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://xezojetit.ru/aws?utm_term=english+books+for+kindergarten+free+download PDF link annotation
    • https://puluzoxaxidu.weebly.com/uploads/1/3/2/6/132683087/5ef4ef70fdab.pdfIn PDF document text
    • http://xagugudel.sportsontheweb.net/salary_of_data_scientist_in_pakistan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367644/normal_5ffd408e5b4cc.pdfIn PDF document text
    • http://nujijaj.getenjoyment.net/kemawobefuwewavoxizibinaf.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/xazovugotufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454977/normal_6026fc6419074.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/6fee1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458856/normal_60298a827913b.pdfIn PDF document text
    • https://fukituxepuronip.weebly.com/uploads/1/3/4/6/134605821/e7ab21acaf69e.pdfIn PDF document text
    • https://povilaromegew.weebly.com/uploads/1/3/4/4/134486615/57fd5e808.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452851/normal_5ff7c9abcbae0.pdfIn PDF document text
    • https://luxutavu.weebly.com/uploads/1/3/5/9/135964445/48d51173bee.pdfIn PDF document text
    • http://munasimowijuxi.getenjoyment.net/basic_concepts_of_physics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495707/normal_603e8e5e1e8e0.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/17080000479.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/7d2663fd-f990-4ea6-b726-d12b6ccb56e1/86526380742.pdfIn PDF document text
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_19fa4b75e5ba4d929ca9fe0b9658bbb0.pdf?index=trueIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_e885f55daeb047948d7a1dec29ccdfe0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14e27dec-21c8-4ad2-b621-6168fd64af76/vefalevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9489d2b7-d0c3-45cb-b976-47bd1ecd741b/polagegawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebf38748-246d-46af-a3cf-dda393201097/95441430425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0db572d3-dc6a-4d69-b00a-5dbef5107e8e/watch_the_disaster_artist_123movies.pdfIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_f863200f6dd14d4b953220e3c9d6aeba.pdf?index=trueIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_65259b3da1d347049af36af7daad7370.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_off000101a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 5420 bytes
SHA-256: 5137c592e1ee0c66a5239d3cd393c5606807af44b73c54d35d4ff19cdcb4fe87
font_01_sfnt_off00011426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11426 11056 bytes
SHA-256: bcd4d567816d1f73b4528b907298e275ee05bbaf7c9b9ddd49ca846eeff12255