Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab593dd0421c7c74…

MALICIOUS

PDF

80.8 KB Created: 2021-03-28 20:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 797cf4add7bdccd4458b23ab849b65e4 SHA-1: 3af32865ecf6add2a778ab999e83d76dfc7018b5 SHA-256: ab593dd0421c7c74f4f35a6bbc2eea5daab1c4813a80d319f5b85f90b4d1aa98
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 hosted on disposable domains, suggesting a link farm designed to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://vilenefex.ru/wix?keyword=cme+project+algebra+1+answer+key+chapter+2', are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://vilenefex.ru/wix?keyword=cme+project+algebra+1+answer+key+chapter+2 PDF link annotation
    • https://murexaxinafol.weebly.com/uploads/1/3/4/4/134456221/korejunedupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465015/normal_60367965dac06.pdfIn PDF document text
    • https://sufusaripowo.weebly.com/uploads/1/3/1/4/131437865/6235685.pdfIn PDF document text
    • https://fikuvigobe.weebly.com/uploads/1/3/4/5/134582673/mikimutepon-babagawilun-xekifegunaf.pdfIn PDF document text
    • https://vakozumemarob.weebly.com/uploads/1/3/1/0/131070483/4e2c0.pdfIn PDF document text
    • https://gujowidupisume.weebly.com/uploads/1/3/4/1/134131448/12d6075ba4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489028/normal_6017a9d4a8538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451542/normal_6020fbae246c2.pdfIn PDF document text
    • https://tumazalewiguta.weebly.com/uploads/1/3/4/7/134755417/a0ebfbd6651f2a0.pdfIn PDF document text
    • https://wezoduvum.weebly.com/uploads/1/3/4/0/134096245/8449210.pdfIn PDF document text
    • http://small-italy.space/zudabesijonenolexurzlmqe.pdfIn PDF document text
    • http://yognat.space/why_is_my_whirlpool_gold_refrigerator_leaking_waterl1sup.pdfIn PDF document text
    • https://xixemoxutosiseg.weebly.com/uploads/1/3/4/4/134473276/9615bc13ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488317/normal_6023739638ebe.pdfIn PDF document text
    • https://giwuvapelefawi.weebly.com/uploads/1/3/4/8/134869604/sowibede.pdfIn PDF document text
    • https://pajolabu.weebly.com/uploads/1/3/4/4/134482361/3642574.pdfIn PDF document text
    • https://lajojadarexod.weebly.com/uploads/1/3/4/5/134506383/bevukavumo.pdfIn PDF document text
    • http://airet.space/xebaxanugunndgij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409413/normal_5fde2e3763757.pdfIn PDF document text
    • https://guvepilafofifiv.weebly.com/uploads/1/3/4/6/134682232/bapupizatek.pdfIn PDF document text
    • https://tabekemaw.weebly.com/uploads/1/3/0/8/130874329/8511dd9.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://a1b876fd-e98f-4594-996d-fc523792ae9e.filesusr.com/ugd/efcbf0_b1f619a773f646059d4a1981877a8419.pdf?index=trueIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_6384bac3917b4101a8b01412596e5792.pdf?index=trueIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_0e5b4407d4cd4350b8b354474d6f5fad.pdf?index=trueIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_e7039542e9c24221b24848995643d577.pdf?index=trueIn PDF document text
    • https://e8802323-0824-40c5-8a58-19d700e27586.filesusr.com/ugd/50cafd_962f6bd080014d7fbc128db70642d54c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 5768 bytes
SHA-256: 8a50f947596a1762c3ed1c57e5675a3cb608e26cf0b842798c06985584c7787a
font_01_sfnt_off00010334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10334 10464 bytes
SHA-256: d38163d2f468a28624ae4930dc92489f6be24fd88afb55b463798ff60ee2cad3
font_02_sfnt_off0001271f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271F 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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