Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5507f49b0ccd905…

MALICIOUS

PDF

88.7 KB Created: 2021-04-28 16:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a428642f43070921be2b4ffbbaa8f614 SHA-1: b109d435126f6126b4a747e6605c62b94b5b3618 SHA-256: a5507f49b0ccd905c2cdd720cc17c757acd9b9b760b9cc33d2325eaa811ac6ce
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many with numeric or generic slugs, indicative of a link farm or SEO spamming technique. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs point to various PDF files hosted on external services, suggesting a multi-stage download or redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=translations+math+worksheets+answers
    • http://autolombardpro.ru/40840929928uw5xp.pdf
    • https://tevukebejesa.weebly.com/uploads/1/3/2/6/132695492/5954771.pdf
    • https://static.s123-cdn-static.com/uploads/4390056/normal_60046b27de22b.pdf
    • https://cdn-cms.f-static.net/uploads/4446152/normal_603e67d37026c.pdf
    • http://experiment.website/xiwuzifotuwodezw86a.pdf
    • https://cdn-cms.f-static.net/uploads/4414678/normal_5fd866867ae98.pdf
    • https://jokuduzasaru.weebly.com/uploads/1/3/1/3/131381103/6eb0a8bf4d082f.pdf
    • https://xekariwunaju.weebly.com/uploads/1/3/1/0/131070431/e189342.pdf
    • https://simazilojimi.weebly.com/uploads/1/3/5/3/135345327/dikolenurozu_bufugenabuxexef_rofoko.pdf
    • https://takadoturig.weebly.com/uploads/1/3/4/1/134108809/4150549.pdf
    • https://cdn-cms.f-static.net/uploads/4451230/normal_6014814ead274.pdf
    • https://wipemaxo.weebly.com/uploads/1/3/5/3/135345075/8842693.pdf
    • https://zoluwapipapak.weebly.com/uploads/1/3/5/3/135321816/7200714.pdf
    • https://xoxatujetila.weebly.com/uploads/1/3/0/7/130775098/f3d0052ef.pdf
    • https://xuxijirabof.weebly.com/uploads/1/3/1/4/131406659/2924170.pdf
    • https://kikosizijup.weebly.com/uploads/1/3/1/3/131379594/mesapefesezap.pdf
    • https://cdn-cms.f-static.net/uploads/4401696/normal_6057e633916ed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xamibebulosaxug/blueprints_psychiatry_6th_edition_free.pdf
    • https://s3.amazonaws.com/baritexovopa/biomes_o_plenty_1._14._4.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bde.bin
97c0edfe50903fc5cc49daf8e76561c620f682d34dee1fa72bd6485c73791b52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDE 5032 bytes
font_01_sfnt_off00012cd8.bin
326a3d14335426ec8e709fe786f92defa4cd2f963cef62fab44d1f2abc8e19d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD8 12140 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.